topic: Ignored TAGS files.

Allow use of TAGS.

Change-Id: I5e71e8986671642b49cc9a62d37cc8c0dfa37181
Signed-off-by: Linus Tolke <linus@tigris.org>
Reviewed-on: http://openocd.zylin.com/595
Reviewed-by: Peter Stuge <peter@stuge.se>
Tested-by: jenkins

.gitignore

@@ -89,5 +89,8 @@ patches
 # Emacs temp files
 *~
 
+# Emacs TAGS file
+TAGS
+
 # CScope database files
 *cscope.out