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/libexpr/package.nix

@@ -1,11 +1,7 @@
 { lib
 , stdenv
 , mkMesonDerivation
-, releaseTools
 
-, meson
-, ninja
-, pkg-config
 , bison
 , flex
 , cmake # for resolving toml11 dep
@@ -64,9 +60,6 @@ mkMesonDerivation (finalAttrs: {
   outputs = [ "out" "dev" ];
 
   nativeBuildInputs = [
-    meson
-    ninja
-    pkg-config
     bison
     flex
     cmake