[gimp] build: add gi-docgen dependency to MSYS2 build

[Daniel Novomeský <dnovomesky src gnome org>]

commit 1397440bab83232173d16d3b946d7e3711b8e88e
Author: Daniel Novomeský <dnovomesky gmail com>
Date:   Mon Dec 27 21:52:21 2021 +0100

    build: add gi-docgen dependency to MSYS2 build

 build/windows/gitlab-ci/build-gimp-msys2.sh | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/build/windows/gitlab-ci/build-gimp-msys2.sh b/build/windows/gitlab-ci/build-gimp-msys2.sh
index 5081c12ae8..c3964c0678 100644
--- a/build/windows/gitlab-ci/build-gimp-msys2.sh
+++ b/build/windows/gitlab-ci/build-gimp-msys2.sh
@@ -33,6 +33,7 @@ pacman --noconfirm -S --needed \
     mingw-w64-$MSYS2_ARCH-drmingw \
     mingw-w64-$MSYS2_ARCH-gexiv2 \
     mingw-w64-$MSYS2_ARCH-ghostscript \
+    mingw-w64-$MSYS2_ARCH-gi-docgen \
     mingw-w64-$MSYS2_ARCH-glib-networking \
     mingw-w64-$MSYS2_ARCH-gobject-introspection \
     mingw-w64-$MSYS2_ARCH-gobject-introspection-runtime \