configure: Re-run make if gtkabi/sdlabi is changed Reconfiguring with a different --with-gtkabi or --with-sdlabi doesn't trigger a remake. Generate an (unused) CONFIG_GTKABI/CONFIG_SDLABI so config-host.h will actually give 'make' something to trigger on. Signed-off-by: Cole Robinson <crobinso@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>