Derek Buitenhuis af2a17c09a cache: Only include unistd.h if it exists ...

This follows suite from f3be359707.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

2012-09-07 19:29:58 +02:00

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