Set git diff driver for C source code files

Git can be told to apply language-specific rules when generating diffs. Enable this for C source code files (*.c and *.h) so that function names are printed right. Specifically, doing so prevents "git diff" from mistakenly considering unindented goto labels as function names.

---
 .gitattributes |    2 ++
 1 file changed, 2 insertions(+)

@@ -0,0 +1,2 @@
+*.c   diff=cpp
+*.h   diff=cpp

Jean Delvare
SUSE L3 Support