checkpolicy: fix bad meta.outputsToInstall

This was silently blocking the channels.  Thanks amine* from IRC.
Maybe inheriting whole meta should be avoided and particular attributes
should be picked instead, as e.g. adding longDescription would have
unexpected consequences as well.

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

@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     "LIBSEPOLA=${stdenv.lib.getLib libsepol}/lib/libsepol.a"
   ];
 
-  meta = libsepol.meta // {
+  meta = removeAttrs libsepol.meta ["outputsToInstall"] // {
     description = "SELinux policy compiler";
   };
 }