Work around ash "alternate value" expansion bug
Ash (used as /bin/sh on many distros) has a shell expansion bug for the form ${var:+word word}. The result is a single argument "word word". Work around by using ${var:+word} ${var:+word} or equivalent. Signed-off-by: NBen Jackson <ben@ben.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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