[nautilus] gitignore: ignore m4 directory

[Carlos Soriano <csoriano src gnome org>]

commit 3aaecdeea8dfb754cedd170ac80302281961b9f9
Author: Carlos Soriano <csoriano gnome org>
Date:   Thu Dec 1 12:57:01 2016 +0100

    gitignore: ignore m4 directory
    
    https://bugzilla.gnome.org/show_bug.cgi?id=775460

 .gitignore |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 70fae94..f7016ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -84,3 +84,4 @@
 /test-driver
 /test/Makefile.in
 /ylwrap
+/m4