meson: Add gtk guard

6 jobs for build_fix in 29 minutes and 30 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Preparation
passed #64103
gst indent

00:00:18

passed #64102
manifest

00:00:19

 
  Build
passed #64104
build fedora x86_64

00:02:42

 
  Test
passed #64105
check fedora

00:15:47

 
  Full Builds
passed #64106
build android arm64 api28

00:03:02

passed #64107
build cerbero fedora x86_64

00:10:41