XFixes: add version check for byteswapped clients

The version check for byteswapped clients was missing.
5 jobs for xfixes-sproc-version-check in 4 minutes and 38 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Docker Image
passed debian-buster #12567940

00:00:20

 
  Build And Test
passed autotools #12567941

00:04:18

passed meson #12567942

00:01:31

passed meson-noglamor #12567943

00:01:57

passed mingw-cross-build #12567944

00:00:35