fix bsd shell negation
On some shells (notably /bin/sh on FreeBSD 6.1), the construct foo && ! bar | baz is true if foo && baz whereas for most other shells (such as bash) is true if foo && ! baz We can work around this by specifying foo && ! (bar | baz) which works everywhere. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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