Solaris: add proper POSIX defines

On Solaris, some POSIX functions are hidden behind a define. This patch adds the proper defines to the compiler command line when building for Solaris.

Patch by icchan. Thanks!



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5642 b64f7644-9d1e-0410-96f1-a4d463321fa5