[gimp/wip/Jehan/incremental-win-installer-improvements] build: add aalib dependency for ASCII Art support.

[Jehan <jehanp src gnome org>]

commit e45d71b316e2e8047292c5165639d607ac1507cb
Author: Jehan <jehan girinstud io>
Date:   Sat May 15 19:40:12 2021 +0200

    build: add aalib dependency for ASCII Art support.

 build/windows/gitlab-ci/build-deps-msys2.sh | 13 +++++++++++++
 1 file changed, 13 insertions(+)
---
diff --git a/build/windows/gitlab-ci/build-deps-msys2.sh b/build/windows/gitlab-ci/build-deps-msys2.sh
index d9470b1159..b504dd188a 100644
--- a/build/windows/gitlab-ci/build-deps-msys2.sh
+++ b/build/windows/gitlab-ci/build-deps-msys2.sh
@@ -62,6 +62,7 @@ export LD_LIBRARY_PATH="${GIMP_PREFIX}/lib:${LD_LIBRARY_PATH}"
 export ACLOCAL_FLAGS="-I/c/msys64/mingw64/share/aclocal"
 export XDG_DATA_DIRS="${GIMP_PREFIX}/share:/mingw64/share/"
 
+# For babl and GEGL, use the master branch.
 git clone --depth=${GIT_DEPTH} https://gitlab.gnome.org/GNOME/babl.git _babl
 git clone --depth=${GIT_DEPTH} https://gitlab.gnome.org/GNOME/gegl.git _gegl
 
@@ -80,3 +81,15 @@ meson -Dprefix="${GIMP_PREFIX}" -Ddocs=false \
       ${GEGL_OPTIONS} ..
 ninja
 ninja install
+cd ../..
+
+# AA-lib is not available in MSYS2.
+wget https://downloads.sourceforge.net/aa-project/aalib-1.4rc5.tar.gz
+echo "9801095c42bba12edebd1902bcf0a990 aalib-1.4rc5.tar.gz" | md5sum -c -
+tar xzf aalib-1.4rc5.tar.gz
+cd aalib-1.4.0
+mkdir _build
+cd _build
+../configure --prefix="${GIMP_PREFIX}"
+make
+make install