[vala] (4 commits) Non-fast-forward update to branch wip/meson

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/meson' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  a961c8e... meson: Add initial build support
  9745d7f... meson: Add tests
  f8ad7a9... meson: Add vapi building
  87b5a27... meson: Check suported cflags for tests

Commits added to the branch:

  e493670... meson: Add initial build support
  bb3b97c... meson: Add tests
  68ef0a4... meson: Add vapi building
  d02fda5... meson: Check suported cflags for tests