[gnome-sudoku/vala-port] build: clean .c and vala stamp files

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c7af192eb1204874d7579ab1af8ad4699e8f518d
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Nov 24 16:32:24 2013 -0600

    build: clean .c and vala stamp files

 src/Makefile.am |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index bfd41ba..2d5d818 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -38,3 +38,7 @@ gnome-sudoku-resources.c: gnome-sudoku.gresource.xml $(shell $(GLIB_COMPILE_RESO
 
 EXTRA_DIST = \
        gnome_sudoku.gresource.xml
+
+CLEANFILES = \
+       $(patsubst %.vala,%.c,$(filter %.vala, $(SOURCES))) \
+       *_vala.stamp