gitlab-ci: merge meson-glvnd into meson-swr

There's no need to have a whole build just for that flag, we can add it
to any build.

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
10 jobs for !679 with gitlab-ci-consolidate in 9 minutes and 22 seconds (queued for 3 seconds)
detached
Status Job ID Name Coverage
  Containers Build
passed #244702
debian

00:00:18

 
  Build+Test
passed #244704
meson-clang

00:09:01

passed #244707
meson-clover-llvm

00:02:49

passed #244708
meson-clover-llvm39

00:01:59

passed #244706
meson-loader-classic-dri

00:04:36

passed #244705
meson-main

00:02:21

passed #244703
meson-swr-glvnd

00:07:05

passed #244710
scons-llvm

00:02:53

passed #244709
scons-nollvm

00:04:22

passed #244711
scons-swr

00:04:33