gst-plugins-bad: No DRM plugins

The DRM plugins (kms, fbdev) offer no benefit to desktop systems
according to upstream, so we should disable them and minimise bloat.

See #388
8 jobs for coldtom/gst-no-drm in 113 minutes and 10 seconds
latest
Status Job ID Name Coverage
  Flatpak
canceled #199576327
aarch64
app_aarch64

01:53:08

passed #199576328
armhf
app_arm

00:59:25

canceled #199576326
cache_i686 x86_64
app_i686

01:53:09

canceled #199576324
cache_x86_64 x86_64
app_x86_64

01:53:10

 
  Vm
canceled #199576332
aarch64 allowed to fail manual
minimal_systemd_vm_aarch64

canceled #199576333
armhf
minimal_systemd_vm_arm

canceled #199576330
cache_i686 x86_64
minimal_systemd_vm_i686

canceled #199576329
cache_x86_64 x86_64
minimal_systemd_vm_x86_64