to avoid nameclashes with [gemcocoawindow].
thanks fede on the mailinglist for pointing that out.

so we can more easily spot them.

so mingw doesn't bail out at the very first header.
now it bails out at the second...

hopefully fixing https://github.com/umlaeute/Gem/issues/225

not really working yet

even though it doesn't seem to do anything useful...

TODO: this should really go into getPixels()