gl: libs: glib might not define G_HAVE_ISO_VARARGS

This will fix the compiler warning
"G_HAVE_ISO_VARARGS" is not defined, evaluates to 0 [-Wundef]
3 jobs for master in 8 minutes and 29 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Manifest
passed manifest #48088

00:00:19

 
  Build
passed build android arm64 api28 #48090

00:05:16

passed build fedora x86_64 #48089

00:02:54