.gitignore: Ignore new autofoo tmp files

Change-Id: Ifb9dfe84575451fdfc9d059bab428da82b448107
diff --git a/.gitignore b/.gitignore
index ece4ee7..eaff7cd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@
 *.pyc
 *.gcda
 *.gcno
+*~
 
 #configure
 aclocal.m4