refactor(build): use vendored versions of mpack and luabitop

src/mpack/lmpack.c

@@ -1171,6 +1171,9 @@ static const luaL_reg mpack_functions[] = {
   {NULL, NULL}
 };
 
+#ifdef NLUA_WIN32
+  __declspec(dllexport)
+#endif
 int luaopen_mpack(lua_State *L)
 {
   /* Unpacker */

src/mpack/lmpack.h

@@ -1,3 +1,6 @@
 #include <lua.h>
 
+#ifdef NLUA_WIN32
+  __declspec(dllexport)
+#endif
 int luaopen_mpack(lua_State *L);