[git commit] .gitignore: add ctags output files

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=702d865fe6ab84c1179275beda6c31f7adaeafa1
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

Exuberant ctags creates an output file called "tags" by default or
"TAGS" when it's run in emacs mode. Add those two files to .gitignore so
they won't be removed by git clean -df.

Signed-off-by: Martin Kaiser <martin at kaiser.cx>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 .gitignore | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.gitignore b/.gitignore
index be1d46199..c03c2e8a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,3 +50,9 @@ cscope.files
 cscope.in.out
 cscope.out
 cscope.po.out
+
+#
+# ctags output
+#
+tags
+TAGS