policycoreutils: fix i686-linux compilation error, closes #9544

This adds a patch to quiet a compiler warning which would be harmless
except that it breaks the build due to use of -Werror.
See http://hydra.nixos.org/build/25151888/nixlog/1

pkgs/os-specific/linux/policycoreutils/default.nix

@@ -12,6 +12,8 @@ stdenv.mkDerivation rec {
     sha256 = "0y9l9k60iy21hj0lcvfdfxs1fxydg6d3pxp9rhy7hwr4y5vgh6dq";
   };
 
+  patches = [ ./fix-printf-type.patch ];
+
   postPatch = ''
     # Fix references to libsepol.a
     find . -name Makefile -exec sed -i 's,[^ ]*/libsepol.a,${libsepol}/lib/libsepol.a,g' {} \;