[physfs] port to cmake-2.6

[Marc Kleine-Budde]

Hey,

cross compiling physfs breaks on our buildsystem, at least with the
latest cmake release 2.6.4

The attached patch fixed the problems,

cheers, Marc

-- 
Pengutronix e.K.                         | Marc Kleine-Budde           |
Linux Solutions for Science and Industry | Phone: +49-231-2826-924     |
Vertretung West/Dortmund                 | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686         | http://www.pengutronix.de   |
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