gitignore: Ignore autofoo files *~

Change-Id: I97997a44e26e8fe9b98606e63aa6d5986d0d85f6
diff --git a/.gitignore b/.gitignore
index ba72477..f4c1cc3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@
 libtool
 ltmain.sh
 m4/*.m4
+*~
 
 # git-version-gen magic
 .tarball-version