git: add (generated) m4 files to .gitignore
diff --git a/.gitignore b/.gitignore
index 25a842b..61ee8e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,4 +34,5 @@
 .rebase-*
 *~
 *.loT
+m4/*.m4