[gimp/wip/Jehan/investigate-CI-break] gitlab-ci: verbose make for the autotools build.

[Jehan <jehanp src gnome org>]

commit 719315aa4a07b5d9658bd8c24c201c3c2483bbc8
Author: Jehan <jehan girinstud io>
Date:   Fri Dec 11 19:39:10 2020 +0100

    gitlab-ci: verbose make for the autotools build.
    
    Not to be merged on master branch. It's only to see if we can get more
    information on the build error.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 061aa25e1f..c4bc1078a0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -139,7 +139,7 @@ gimp-autotools-debian:
     - ../autogen.sh
         --prefix="${INSTALL_PREFIX}"
         --enable-debug
-    - make -j "$(nproc)"
+    - make -j "$(nproc)" V=1
     - make check
 
 gimp-distcheck-debian: