[glib/1416-macos-ci] Update .gitlab-ci.yml

[Xavier Claessens <xclaesse src gnome org>]

commit 4302d403bb082527d79fa3efe28081c78bd322c3
Author: Xavier Claessens <xclaesse gmail com>
Date:   Fri Jan 3 16:44:10 2020 +0000

    Update .gitlab-ci.yml

 .gitlab-ci.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4957db4a5..2a4b5b73d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -327,7 +327,10 @@ macos:
   tags:
     - macos
   before_script:
-    - which meson || pip3 install --upgrade meson==0.49.2
+    - which python
+    - which python3
+    - which pip
+    - which meson || pip3 install meson==0.49.2
   script:
     # FIXME: Add --werror
     - meson ${MESON_COMMON_OPTIONS}