packaging: Add mesonLayer

... and remove a few unused arguments.

This adds pkg-config to a two or three packages that don't use it,
but we shouldn't let that bother us. It's like our personal stdenv.

src/libmain-c/package.nix

@@ -1,11 +1,6 @@
 { lib
 , stdenv
 , mkMesonDerivation
-, releaseTools
-
-, meson
-, ninja
-, pkg-config
 
 , nix-util-c
 , nix-store
@@ -40,12 +35,6 @@ mkMesonDerivation (finalAttrs: {
 
   outputs = [ "out" "dev" ];
 
-  nativeBuildInputs = [
-    meson
-    ninja
-    pkg-config
-  ];
-
   propagatedBuildInputs = [
     nix-util-c
     nix-store