blame: use built-in xdiff
This removes the last use of external diff from core git suite.
Also addresses the use of index() -- elsewhere we tend to use
strchr().
Signed-off-by: NJunio C Hamano <junkio@cox.net>
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This removes the last use of external diff from core git suite.
Also addresses the use of index() -- elsewhere we tend to use
strchr().
Signed-off-by: NJunio C Hamano <junkio@cox.net>