[mutter] project: add **/tags.* to gitignore

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 0853fb940a0eaa499670f3ea9e4b611870077a6f
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sun Aug 20 10:37:33 2017 -0300

    project: add **/tags.* to gitignore
    
    Builds adds lots of them in the source tree.

 .gitignore |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 4d3737d..eb123d4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -115,3 +115,4 @@ ltsugar.m4
 ltversion.m4
 lt~obsolete.m4
 .dirstamp
+**/tags.*