gitignore gtags

Change-Id: I0160cdfc8e749f875a232e07526d53a3a7c8395c
Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com>
diff --git a/.gitignore b/.gitignore
index 5925c24..689d009 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,6 +58,10 @@
 # cscope and ctags
 /cscope.*
 /tags
+# ggtags
+GPATH
+GRTAGS
+GTAGS
 
 # Generated documentation
 /build-root/docs