misc pkgs: Basic sed to get fix pkgconfig and autoreconfHook buildInputs

Only acts on one-line dependency lists.

pkgs/misc/my-env/default.nix

@@ -6,7 +6,8 @@
     packageOverrides = pkgs : with pkgs; {
       sdlEnv = pkgs.myEnvFun {
           name = "sdl";
-          buildInputs = [ stdenv SDL SDL_image SDL_ttf SDL_gfx cmake SDL_net  pkgconfig];
+  nativeBuildInputs = [ pkgconfig ];
+          buildInputs = [ stdenv SDL SDL_image SDL_ttf SDL_gfx cmake SDL_net];
       };
     };
   }