[glib/1416-macos-ci] WIP: Try installing meson on macos runnner

[Xavier Claessens <xclaesse src gnome org>]

commit 3dfcd01c7c5d24eb80de9b3081d638da680a95e5
Author: Xavier Claessens <xclaesse gmail com>
Date:   Fri Jan 3 16:40:53 2020 +0000

    WIP: Try installing meson on macos runnner

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9f680a205..4957db4a5 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -326,6 +326,8 @@ macos:
     - branches@GNOME/glib
   tags:
     - macos
+  before_script:
+    - which meson || pip3 install --upgrade meson==0.49.2
   script:
     # FIXME: Add --werror
     - meson ${MESON_COMMON_OPTIONS}