add git-src to .gitignore

Signed-off-by: Daniel Golle <daniel.golle@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39225 3c298f89-4303-0410-b956-a3cf2f4a3e73

.gitignore

@@ -21,4 +21,5 @@
 .#*
 *#
 .emacs.desktop*
-TAGS*~
\ No newline at end of file
+TAGS*~
+git-src
\ No newline at end of file