tree-wide: platforms = platforms.gnu; -> platforms = gnu ++ linux

"platforms.gnu" has been linux-only since at least 17.03:

$ nix eval -f channel:nixos-17.03 lib.platforms.gnu
[ "i686-linux" "x86_64-linux" "armv5tel-linux" "armv6l-linux" "armv7l-linux" "aarch64-linux" "mips64el-linux" ]

Unlike platforms.linux, platforms.gnu indicates "must use glibc"
which for the most part is not intended.

Replacing platforms.gnu with platforms.linux would be the same "today"
but let's err on preserving existing behavior and be optimistic
about platforms these packages work on.

pkgs/applications/audio/mpg321/default.nix

@@ -30,6 +30,6 @@ stdenv.mkDerivation rec {
     homepage = http://mpg321.sourceforge.net/;
     license = licenses.gpl2;
     maintainers = [ maintainers.rycee ];
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/applications/graphics/geeqie/default.nix

@@ -49,6 +49,6 @@ stdenv.mkDerivation rec {
     homepage = http://geeqie.sourceforge.net;
 
     maintainers = with maintainers; [ jfrankenau pSub ];
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/applications/graphics/ocrad/default.nix

@@ -29,6 +29,6 @@ stdenv.mkDerivation rec {
 
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ pSub ];
-    platforms = platforms.gnu;  # arbitrary choice
+    platforms = platforms.gnu ++ platforms.linux;  # arbitrary choice
   };
 }

pkgs/applications/graphics/scantailor/advanced.nix

@@ -44,6 +44,6 @@ stdenv.mkDerivation rec {
     description = "Interactive post-processing tool for scanned pages";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ jfrankenau ];
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/applications/networking/instant-messengers/bitlbee/default.nix

@@ -50,6 +50,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl2Plus;
 
     maintainers = with maintainers; [ wkennington pSub ];
-    platforms = platforms.gnu;  # arbitrary choice
+    platforms = platforms.gnu ++ platforms.linux;  # arbitrary choice
   };
 }

pkgs/applications/networking/instant-messengers/telepathy/logger/default.nix

@@ -31,6 +31,6 @@ stdenv.mkDerivation rec {
     homepage = https://telepathy.freedesktop.org/components/telepathy-logger/;
     license = licenses.lgpl21;
     maintainers = with maintainers; [ jtojnar ];
-    platforms = platforms.gnu; # Arbitrary choice
+    platforms = platforms.gnu ++ platforms.linux; # Arbitrary choice
   };
 }

pkgs/applications/networking/instant-messengers/telepathy/salut/default.nix

@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Link-local XMPP connection manager for Telepathy";
-    platforms = platforms.gnu; # Random choice
+    platforms = platforms.gnu ++ platforms.linux; # Random choice
     maintainers = [ maintainers.lethalman ];
   };
 }

pkgs/applications/networking/p2p/gnunet/default.nix

@@ -73,6 +73,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl2Plus;
 
     maintainers = with maintainers; [ viric vrthra ];
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/development/guile-modules/guile-lib/default.nix

@@ -40,6 +40,6 @@ in stdenv.mkDerivation {
     homepage = "http://www.nongnu.org/guile-lib/";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ vyp ];
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/development/guile-modules/guile-ncurses/default.nix

@@ -39,6 +39,6 @@ in stdenv.mkDerivation {
     homepage = "https://www.gnu.org/software/guile-ncurses/";
     license = licenses.lgpl3Plus;
     maintainers = with maintainers; [ vyp ];
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/development/libraries/libchamplain/default.nix

@@ -38,6 +38,6 @@ stdenv.mkDerivation rec {
     '';
 
      maintainers = gnome3.maintainers;
-     platforms = platforms.gnu;  # arbitrary choice
+     platforms = platforms.gnu ++ platforms.linux;  # arbitrary choice
   };
 }

pkgs/development/libraries/libchop/default.nix

@@ -50,6 +50,6 @@ stdenv.mkDerivation rec {
     homepage = http://nongnu.org/libchop/;
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ viric ];
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/development/libraries/vcdimager/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     homepage = http://www.gnu.org/software/vcdimager/;
     description = "Full-featured mastering suite for authoring, disassembling and analyzing Video CDs and Super Video CDs";
-    platforms = platforms.gnu; # random choice
+    platforms = platforms.gnu ++ platforms.linux; # random choice
     license = licenses.gpl2;
   };
 }

pkgs/tools/graphics/logstalgia/default.nix

@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
       a Miscellaneous section.
     '';
 
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
     maintainers = with maintainers; [ pSub ];
   };
 }

pkgs/tools/misc/grub/pvgrub_image/default.nix

@@ -37,6 +37,6 @@ stdenv.mkDerivation rec {
          Xen guests
       '';
 
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 })

pkgs/tools/misc/grub/trusted.nix

@@ -98,6 +98,6 @@ stdenv.mkDerivation rec {
     description = "GRUB 2.0 extended with TCG (TPM) support for integrity measured boot process (trusted boot)";
     homepage = https://github.com/Sirrix-AG/TrustedGRUB2;
     license = licenses.gpl3Plus;
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/tools/networking/mailutils/default.nix

@@ -116,6 +116,6 @@ in stdenv.mkDerivation rec {
     homepage = http://www.gnu.org/software/mailutils/;
 
     # Some of the dependencies fail to build on {cyg,dar}win.
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/tools/security/gnupg/1.nix

@@ -27,6 +27,6 @@ stdenv.mkDerivation rec {
       other applications.  A wealth of frontend applications and libraries are
       available.
     '';
-    platforms = platforms.gnu; # arbitrary choice
+    platforms = platforms.gnu ++ platforms.linux; # arbitrary choice
   };
 }

pkgs/tools/text/numdiff/default.nix

@@ -18,6 +18,6 @@ stdenv.mkDerivation rec {
     homepage = http://www.nongnu.org/numdiff/;
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ ndowens ];
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }

pkgs/tools/video/dvgrab/default.nix

@@ -34,6 +34,6 @@ stdenv.mkDerivation rec {
     homepage = http://kinodv.org/;
 
     license = licenses.gpl2Plus;
-    platforms = platforms.gnu;
+    platforms = platforms.gnu ++ platforms.linux;
   };
 }