[gimp/wip/Jehan/incremental-win-installer-improvements] Also run autoconf!

[Jehan <jehanp src gnome org>]

commit 9edae0cbf81148f11a7a704d5e96e93ac1074ace
Author: Jehan <jehan girinstud io>
Date:   Sun May 16 16:51:09 2021 +0200

    Also run autoconf!

 build/windows/gitlab-ci/build-deps-msys2.sh | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/build/windows/gitlab-ci/build-deps-msys2.sh b/build/windows/gitlab-ci/build-deps-msys2.sh
index 46f0df500f..0c674a0614 100644
--- a/build/windows/gitlab-ci/build-deps-msys2.sh
+++ b/build/windows/gitlab-ci/build-deps-msys2.sh
@@ -78,6 +78,7 @@ wget "http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub
 aclocal
 libtoolize --force
 automake --add-missing
+autoconf
 mkdir _build
 cd _build
 ../configure --prefix="${GIMP_PREFIX}" --enable-shared