mod_lua: Improve compatibility with Lua 5.1, 5.2 and 5.3.

mod_lua: Improve compatibility with Lua 5.1, 5.2 and 5.3.
PR58188, PR60831, PR61245.

CTR

The following lua 5.2 and 5.3 compat change
should be checked for runtime correctness
by someone more knowledgeable about lua.

Index: modules/lua/lua_apr.c
--- modules/lua/lua_apr.c (original)
+++ modules/lua/lua_apr.c Tue Jul  4 20:48:43 2017
@@ -82,7 +82,11 @@ static const luaL_Reg lua_table_methods[
 int ap_lua_init(lua_State *L, apr_pool_t *p)
 {
     luaL_newmetatable(L, "Apr.Table");
+#if LUA_VERSION_NUM < 502
     luaL_register(L, "apr_table", lua_table_methods);
+#else
+    luaL_newlib(L, lua_table_methods);
+#endif
     lua_pushstring(L, "__index");
     lua_pushstring(L, "get");
     lua_gettable(L, 2);

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1800835 13f79535-47bb-0310-9956-ffa450edef68