[gimp/gimp-2-10] gitlab-ci: run distcheck with multi-jobs.

[Jehan <jehanp src gnome org>]

commit e1d88f1765459c2659cff7315cfb4388da214b88
Author: Jehan <jehan girinstud io>
Date:   Fri Aug 7 15:31:50 2020 +0200

    gitlab-ci: run distcheck with multi-jobs.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dc7509dead..e7bf2823de 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -190,5 +190,5 @@ gimp-debian/testing-autotools-distcheck:
         --disable-python
         --enable-gtk-doc
     - make -j "$(nproc)"
-    - make distcheck
+    - make -j "$(nproc)" distcheck
   allow_failure: true