Build GTK without Vulkan support

The Vulkan renderer is experimental, and the Vulkan support
has the tendency to crash when you open the inspector, so
it is negatively affecting people even if they are not
using Vulkan.

Part-of: <!1220>
8 jobs for gtk-no-vulkan in 14 minutes and 12 seconds (queued for 6 seconds)
Status Name Job ID Coverage
  Track
passed track #1399131
x86_64 gnome-build-meta

00:01:52

 
  Build
passed build-aarch64 #1399134
aarch64 gnome-build-meta

00:12:20

passed build-i386 #1399133
x86_64 gnome-build-meta

00:07:13

passed build-x86_64 #1399132
x86_64 gnome-build-meta

00:10:14

 
  Deploy
manual iso-installer-x86_64 #1399138
x86_64 gnome-build-meta allowed to fail manual
manual raspberrypi-4-image #1399137
aarch64 gnome-build-meta allowed to fail manual
manual rock64-image #1399136
aarch64 gnome-build-meta allowed to fail manual
manual vm-image-x86_64 #1399135
x86_64 gnome-build-meta allowed to fail manual