[gimp] build: fix packaging step with MSYS2 GTK+3.

[Jehan <jehanp src gnome org>]

commit 6cf3d67e64a1637506dbe0c5bedcda168a1f2847
Author: Jehan <jehan girinstud io>
Date:   Tue Dec 21 00:41:00 2021 +0100

    build: fix packaging step with MSYS2 GTK+3.

 build/windows/gitlab-ci/package-gimp-msys2.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/build/windows/gitlab-ci/package-gimp-msys2.sh b/build/windows/gitlab-ci/package-gimp-msys2.sh
index 5016529362..cd40f48df7 100644
--- a/build/windows/gitlab-ci/package-gimp-msys2.sh
+++ b/build/windows/gitlab-ci/package-gimp-msys2.sh
@@ -90,7 +90,7 @@ echo "bin\gimp-2.99.exe" > ${GIMP_DISTRIB}/gimp.cmd
 
 # Package library data and modules.
 cp -fr ${MSYS_PREFIX}/etc/fonts ${GIMP_DISTRIB}/etc/
-cp -fr ${GIMP_PREFIX}/etc/gtk-3.0 ${GIMP_DISTRIB}/etc/
+cp -fr ${MSYS_PREFIX}/etc/gtk-3.0 ${GIMP_DISTRIB}/etc/
 
 mkdir ${GIMP_DISTRIB}/lib/
 cp -fr ${GIMP_PREFIX}/lib/gimp ${GIMP_DISTRIB}/lib/
@@ -102,7 +102,7 @@ cp -fr ${GIMP_PREFIX}/lib/girepository-1.0/* ${GIMP_DISTRIB}/lib/girepository-1.
 
 cp -fr ${MSYS_PREFIX}/lib/gio ${GIMP_DISTRIB}/lib/
 cp -fr ${MSYS_PREFIX}/lib/gdk-pixbuf-2.0 ${GIMP_DISTRIB}/lib/
-cp -fr ${GIMP_PREFIX}/lib/gtk-3.0 ${GIMP_DISTRIB}/lib/
+cp -fr ${MSYS_PREFIX}/lib/gtk-3.0 ${GIMP_DISTRIB}/lib/
 
 cp -fr ${MSYS_PREFIX}/lib/python3.9 ${GIMP_DISTRIB}/lib/