we were not updating argc in vips.c after all calls to g_option_context_parse_strv() on Windows, leading to a crash in some cases see https://github.com/jcupitt/libvips/issues/553
we were not updating argc in vips.c after all calls to g_option_context_parse_strv() on Windows, leading to a crash in some cases see https://github.com/jcupitt/libvips/issues/553