[gimp/wip/Jehan/CI-Windows] Trying to install mingw-w64-gcc (again).

[Jehan <jehanp src gnome org>]

commit c6fb06cae7de6c0e4e6dd26b53bb781f415ba7cd
Author: Jehan <jehan girinstud io>
Date:   Wed Sep 25 16:31:09 2019 +0200

    Trying to install mingw-w64-gcc (again).
    
    Is that seriously how you install a package as common as a C
    cross-compiler for Windows in Arch?!

 .gitlab-ci.yml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 029461806a..b5d3c66e12 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -36,6 +36,10 @@ cache:
         base-devel
         python-docutils
         python-pip
+    - wget https://aur.archlinux.org/cgit/aur.git/snapshot/mingw-w64-gcc.tar.gz
+    - tar xzf mingw-w64-gcc.tar.gz
+    - cd mingw-w64-gcc
+    - makepkg -si
     - pip3 install crossroad
 
 build-git-x86_64-w64-mingw32-meson: