Use header files for lua libraries;

src/lib/lua-cjson/lua_cjson.h

@@ -0,0 +1,5 @@
+#include "luax.h"
+
+#pragma once
+
+int luaopen_cjson(lua_State *l);

src/lib/lua-enet/enet.h

@@ -0,0 +1,5 @@
+#include "luax.h"
+
+#pragma once
+
+int luaopen_enet(lua_State *l);

src/lovr.c

@@ -3,12 +3,11 @@
 #include "api/lovr.h"
 #include "data/boot.lua.h"
 #include "data/logo.png.h"
+#include "lib/lua-cjson/lua_cjson.h"
+#include "lib/lua-enet/enet.h"
 #include "lib/glfw.h"
 #include <stdlib.h>
 
-int luaopen_cjson(lua_State* L);
-int luaopen_enet(lua_State* L);
-
 static void onGlfwError(int code, const char* description) {
   error(description);
 }