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: NJunio 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: NJunio C Hamano <gitster@pobox.com>