pinfo: fix build for ncurses-6.3

Otherwise on upcoming ncurses-6.3 the build fails as:

    video.c:114:26: error: format '%d' expects argument of type 'int',
      but argument 3 has type 'long unsigned int' [-Werror=format=]
      114 |                 printw(_("Viewing line %d/%d, 100%%"), lines, lines);
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~

While at it pull upstream fix for -fcommon toolchains (vanilla gcc-10)
and pending fix for gcc-11.

pkgs/applications/misc/pinfo/default.nix

@@ -1,6 +1,7 @@
 { lib
 , autoreconfHook
 , fetchFromGitHub
+, fetchpatch
 , gettext
 , ncurses
 , readline
@@ -19,6 +20,31 @@ stdenv.mkDerivation rec {
     sha256 = "173d2p22irwiabvr4z6qvr6zpr6ysfkhmadjlyhyiwd7z62larvy";
   };
 
+  patches = [
+    # Pull upstream fix for -fno-common toolchains
+    (fetchpatch {
+      name = "fno-common.patch";
+      url = "https://github.com/baszoetekouw/pinfo/commit/16dba5978146b6d3a540ac7c8f415eda49280847.patch";
+      sha256 = "148fm32chvq8x9ayq9cnhgszh10g5v0cv0xph67fa7sp341p09wy";
+    })
+
+    # Fix pending upstream inclusion for build on ncurses-6.3:
+    #   https://github.com/baszoetekouw/pinfo/pull/27
+    (fetchpatch {
+      name = "ncurses-6.3.patch";
+      url = "https://github.com/baszoetekouw/pinfo/commit/fc67ceacd81f0c74fcab85447c23a532ae482827.patch";
+      sha256 = "08phmng8vgfqjjazys05acpd5gh110malhw3sx29dg86nsrg2khs";
+    })
+
+    # Fix pending upstream inclusion for build on gcc-11:
+    #   https://github.com/baszoetekouw/pinfo/pull/27
+    (fetchpatch {
+      name = "gcc-11.patch";
+      url = "https://github.com/baszoetekouw/pinfo/commit/ab604fdb67296dad27f3a25f3c9aabdd2fb8c3fa.patch";
+      sha256 = "09g8msgan2x48hxcbm7l6j3av6n8i0bsd4g0vf5xd8bxwzynb13m";
+    })
+  ];
+
   nativeBuildInputs = [
     autoreconfHook
   ];