WIP: Fix G_GNUC_PRINTF/G_GNUC_SCANF function attributes for Win32 and GCC.

Anselm Kruis requested to merge akruis/glib:akruis_fix_mingw_gmacros into master

The Windows msvcrXX.dll uses different format strings than UNIX/Linux libc. Therefore we must use a mingw specific format archetype for mingw.

The patch was required to cross compile current glib2 master on fedora core 28 using autogen.sh.

Edited by Anselm Kruis

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