grep: rip out support for external grep
We still allow people to pass --[no-]ext-grep on the command line, but the option is ignored. Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We still allow people to pass --[no-]ext-grep on the command line, but the option is ignored. Signed-off-by: Junio C Hamano <gitster@pobox.com>