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

[Xavier Claessens <xclaesse src gnome org>]

commit 40256bd4e740aebad67c0bcbe014575d36cba1f8
Author: Xavier Claessens <xclaesse gmail com>
Date:   Tue Jan 7 15:15:39 2020 +0000

    Update .gitlab-ci.yml

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ebcedbb08..a325207f1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -328,6 +328,7 @@ macos:
     - macos
   before_script:
     - which meson || pip3 install --user meson==0.49.2
+    - export PATH=/Users/gitlabrunner/Library/Python/3.7/bin:$PATH
   script:
     # FIXME: Add --werror
     - meson ${MESON_COMMON_OPTIONS}