[gitg] Clean up 'plugins/diff/icons/Makefile'

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 9da6254865d3b056b56cd7a237e50d80e34f7c7e
Author: Techlive Zheng <techlivezheng gmail com>
Date:   Thu May 23 07:22:55 2013 +0800

    Clean up 'plugins/diff/icons/Makefile'

 plugins/diff/icons/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/diff/icons/Makefile.am b/plugins/diff/icons/Makefile.am
index 0a6ff1d..c07a564 100644
--- a/plugins/diff/icons/Makefile.am
+++ b/plugins/diff/icons/Makefile.am
@@ -1,4 +1,4 @@
 ICONS = diff-symbolic.svg
 
 include $(top_srcdir)/icons.mk
-include $(top_srcdir)/git.mk
+-include $(top_srcdir)/git.mk