amdadl-sdk: Don't build on Hydra

Since it uses requireFile, it won't build.  Likewise for cgminer which
depends on amdadl-sdk.

pkgs/applications/misc/cgminer/default.nix

@@ -1,5 +1,5 @@
-{ fetchgit, stdenv, pkgconfig, libtool, autoconf, automake,
-  curl, ncurses, amdappsdk, amdadlsdk, xorg, jansson }:
+{ fetchgit, stdenv, pkgconfig, libtool, autoconf, automake
+, curl, ncurses, amdappsdk, amdadlsdk, xorg, jansson }:
 
 stdenv.mkDerivation rec {
   version = "3.7.2";
@@ -42,6 +42,7 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/ckolivas/cgminer";
     license = licenses.gpl3;
     maintainers = [ maintainers.offline ];
-    platforms = [ "i686-linux" "x86_64-linux" ];
+    platforms = stdenv.lib.platforms.linux;
+    hydraPlatforms = [];
   };
 }

pkgs/development/misc/amdadl-sdk/default.nix

@@ -44,6 +44,7 @@ stdenv.mkDerivation rec {
     homepage = http://developer.amd.com/tools/graphics-development/display-library-adl-sdk/;
     license = licenses.amdadl;
     maintainers = [ maintainers.offline ];
-    platforms = [ "i686-linux" "x86_64-linux" ];
+    platforms = stdenv.lib.platforms.linux;
+    hydraPlatforms = [];
   };
 }