gcc compile issue on centos 7

[paulandrewhughes]

Using gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) on centos 7 the compliler complains about missing typename.

Adding typename where the compiler suggests fixes the issue and allows the example to compile and run.

$ git diff
diff --git a/luaaa.hpp b/luaaa.hpp
index d8cdc86..7b112fa 100644
--- a/luaaa.hpp
+++ b/luaaa.hpp
@@ -2523,7 +2523,7 @@ namespace LUAAA_NS
 #else
             luaL_Reg regtab = { nullptr, nullptr };
             luaL_openlib(m_state, m_moduleName, &regtab, 0);
-            auto uData = (LuaClass<TCLASS, TAG>::UserDataDetail*)lua_newuserdata(m_state, sizeof(LuaClass<TCLASS, TAG>::UserDataDetail));
+            auto uData = (typename LuaClass<TCLASS, TAG>::UserDataDetail*)lua_newuserdata(m_state, sizeof(typename LuaClass<TCLASS, TAG>::UserDataDetail));^M
             if (uData)
             {
                 uData->obj = userData.obj;