[gnome-builder] build: update GITIGNOREFILES

[Christian Hergert <chergert src gnome org>]

commit f51f0f09f810259eda32b99eca4fa7aef59d8c75
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jan 3 18:48:49 2017 -0800

    build: update GITIGNOREFILES

 libidemm/src/Makefile.am |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libidemm/src/Makefile.am b/libidemm/src/Makefile.am
index 93db830..1cf919d 100644
--- a/libidemm/src/Makefile.am
+++ b/libidemm/src/Makefile.am
@@ -17,4 +17,6 @@ include $(top_srcdir)/libidemm/generate-binding.am
 endif
 endif
 
+GITIGNOREFILES = .stamps
+
 -include $(top_srcdir)/git.mk