[gtk] CI: install brotli in msys2

[Christoph Reiter <creiter src gnome org>]

commit 90b3105d99d694876e04b69876e04b34222b8d2a
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sun May 10 08:31:37 2020 +0200

    CI: install brotli in msys2
    
    Not a direct dependency, but the freetype package is missing it atm

 .gitlab-ci/test-msys2.sh | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.gitlab-ci/test-msys2.sh b/.gitlab-ci/test-msys2.sh
index 8008443d18..75c29876df 100644
--- a/.gitlab-ci/test-msys2.sh
+++ b/.gitlab-ci/test-msys2.sh
@@ -37,6 +37,9 @@ pacman --noconfirm -S --needed \
 wget 
"https://gitlab.gnome.org/creiter/gitlab-ci-win32-runner-v2/raw/master/pango/mingw-w64-$MSYS2_ARCH-pango-1.44.7-1-any.pkg.tar.xz";
 pacman --noconfirm -U "mingw-w64-$MSYS2_ARCH-pango-1.44.7-1-any.pkg.tar.xz"
 
+# https://github.com/msys2/MINGW-packages/pull/6465
+pacman --noconfirm -S --needed mingw-w64-$MSYS2_ARCH-brotli
+
 mkdir -p _ccache
 export CCACHE_BASEDIR="$(pwd)"
 export CCACHE_DIR="${CCACHE_BASEDIR}/_ccache"