[gimp] gitlab-ci: add missing dependencies.

[Jehan <jehanp src gnome org>]

commit f6e9c6ee6f8f7223297aeb92038c20667113a62d
Author: Jehan <jehan girinstud io>
Date:   Wed Mar 18 20:45:54 2020 +0100

    gitlab-ci: add missing dependencies.
    
    Dependencies must be reinstalled on different jobs, even when related.
    Fixes these CI errors on unit testing:
    
    > GEGL-Message: 22:30:35.867: Module 
'/builds/GNOME/gimp/_install/lib/x86_64-linux-gnu/gegl-0.4/matting-levin.so' load error: libumfpack.so.5: 
cannot open shared object file: No such file or directory
    > GEGL-MESSAGE: Module '/builds/GNOME/gimp/_install/lib/x86_64-linux-gnu/gegl-0.4/raw-load.so' load 
error: libraw.so.19: cannot open shared object file: No such file or directory
    
    (cherry picked from commit a90d547cc0cda0b1addf2a7e2a2f40118b95cd39)

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d5cdbae2f4..934c0267a2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -105,9 +105,11 @@ deps-debian/testing:
         libmypaint-dev
         libopenexr-dev
         libpoppler-glib-dev
+        libraw19
         librsvg2-dev
         libtiff-dev
         libtool
+        libumfpack5
         libwebp-dev
         libwmf-dev
         libxmu-dev