diff: don't show function name by default
We'd mistakenly made the -p option always on, which meant there was no
way to turn it off. It also meant that we were sometimes splitting
multibyte characters in function name, which isn't a good default.
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diff -r c1fab96507ef a
--- a/a
+++ b/a
@@ -1,1 +1,1 @@
-foo
+barber