now we can get upvalue name + build with for LUABIND_NO_EXCEPTIONS mode

[bagobor]

Sorry for second fix in single pull request. (It was automatically added as I pushed new fix to my fork.)

[nitrocaster]

Why don't you provide a test for this feature?

upd: nevermind, I misread the message.

[bagobor]

@nitrocaster FYI :santa: Sample code for upvalue name ( I used it to avoid chunk recompilation in my scripted entity system):

    luaL_loadstring(L,script.c_str());
    luabind::object compiledScript(luabind::from_stack(L, -1));

    for (int index = 1;;++index) { 
        auto upv = luabind::getupvalue(compiledScript, index);
        auto name = std::get<0>(upv);
        if (!name) break;
        std::cout << name << endl;
    }

[nitrocaster]

Looks reasonable for me. @decimad, how about merge?

[decimad]

There we go! Thank you!