[gimp] desktop: adding test-desktop.sh in EXTRA_DIST.

[Jehan Pagès <jehanp src gnome org>]

commit cadde8fbffffdf03d7057e80c68c7323a9fe0cb2
Author: Jehan <jehan girinstud io>
Date:   Sun May 20 19:19:44 2018 +0200

    desktop: adding test-desktop.sh in EXTRA_DIST.
    
    Otherwise make check would fail from distributed packages (e.g. make
    distcheck)!

 desktop/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/desktop/Makefile.am b/desktop/Makefile.am
index 519dda0..bf29ab7 100644
--- a/desktop/Makefile.am
+++ b/desktop/Makefile.am
@@ -47,6 +47,7 @@ endif
 EXTRA_DIST = \
        $(appstream_in_files) \
        test-appdata.sh       \
+       test-desktop.sh       \
        gimp.desktop.in.in    \
        16x16/gimp.png        \
        22x22/gimp.png        \