[libgda] CI: Added make distcheck for Autotools

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit e4e462a85a99376c09e7dde5640bf5edb2558f24
Author: Daniel Espinosa <esodan gmail com>
Date:   Sun Jul 8 09:15:38 2018 -0500

    CI: Added make distcheck for Autotools
    
    make distcheck will rise errors on producing distributable
    Autotools tarballs and out of tree builds

 .gitlab-ci.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c944fa187..5ca3d86dd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -41,7 +41,8 @@ autotools_build:
   - make
   - broadwayd &
   - GDK_BACKEND=broadway make check
-  - make install
+  - make distclean
+  - make distcheck
   artifacts:
     when: on_failure
     paths: