lua: fixed the way to create environments

`paths =  requiredLuaModules (extraLibs ++ [ lua ] );` would discard lua
and so in absence of a propagated lua, the lua.withPackages would return
an empty bin/ directory.

pkgs/development/interpreters/lua-5/build-luarocks-package.nix

@@ -89,6 +89,7 @@ let
   generatedRockspecFilename = "./${self.pname}-${self.rockspecVersion}.rockspec";
 
   nativeBuildInputs = [
+    lua  # for lua.h
     wrapLua
     luarocks
   ];

pkgs/development/interpreters/lua-5/wrapper.nix

@@ -10,7 +10,7 @@
 # Create a lua executable that knows about additional packages.
 let
   env = let
-    paths =  requiredLuaModules (extraLibs ++ [ lua ] );
+    paths = [ lua ] ++ requiredLuaModules extraLibs;
   in buildEnv {
     name = "${lua.name}-env";
 

pkgs/development/lua-modules/overrides.nix

@@ -641,7 +641,8 @@ in
       tar xf *.tar.gz
     '';
 
-    propagatedBuildInputs = [ lua luaposix
+    propagatedBuildInputs = [
+      luaposix
       readline.out
     ];