blame: unbreak "diff -U 0".
The commit 604c86d1 changed the original "diff -u0" to "diff -u -U 0" for portability. A big mistake without proper testing. The form "diff -u -U 0" shows the default 3-line contexts, because -u and -U 0 contradicts with each other; "diff -U 0" (or its longhand "diff --unified=0") is what we meant. Signed-off-by: NJunio C Hamano <junkio@cox.net>
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