Code review comment for lp:~widelands-dev/widelands/appveyor_fix

I have downloaded the source code for glbinding and there is nothing else to use, so I have changed the placeholder to %p. If it now will complain about the pointers not being void* and about nothing else, we can surround it with a macro that I created to shut it up, like this:

    FORMAT_WARNINGS_OFF;
    molog("Some log %p\n", pointer);
    FORMAT_WARNINGS_ON;

I'd like to see the compiler output first though.