packaging: Add mkMeson{Library,Executable}

and:
- move pkg-config out of mkMesonDerivation, for components that don't
  produce any executable code

src/libcmd/package.nix

@@ -1,6 +1,6 @@
 { lib
 , stdenv
-, mkMesonDerivation
+, mkMesonLibrary
 
 , nix-util
 , nix-store
@@ -33,7 +33,7 @@ let
   inherit (lib) fileset;
 in
 
-mkMesonDerivation (finalAttrs: {
+mkMesonLibrary (finalAttrs: {
   pname = "nix-cmd";
   inherit version;
 
@@ -49,8 +49,6 @@ mkMesonDerivation (finalAttrs: {
     (fileset.fileFilter (file: file.hasExt "hh") ./.)
   ];
 
-  outputs = [ "out" "dev" ];
-
   buildInputs = [
     ({ inherit editline readline; }.${readlineFlavor})
   ] ++ lib.optional enableMarkdown lowdown;
@@ -82,10 +80,6 @@ mkMesonDerivation (finalAttrs: {
     LDFLAGS = "-fuse-ld=gold";
   };
 
-  separateDebugInfo = !stdenv.hostPlatform.isStatic;
-
-  hardeningDisable = lib.optional stdenv.hostPlatform.isStatic "pie";
-
   meta = {
     platforms = lib.platforms.unix ++ lib.platforms.windows;
   };