Merge pull request #175779 from patricksjackson/fno-common-xbindkeys

xbindkeys-config: add -fcommon workaround

pkgs/tools/X11/xbindkeys-config/default.nix

···
   pname = "xbindkeys-config";
   version = "0.1.3";
 
+  # Workaround build failure on -fno-common toolchains like upstream
+  # gcc-10.
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
   nativeBuildInputs = [ pkg-config makeWrapper ];
   buildInputs = [ gtk ];