[mythtv] Mac OS X patch 20

[Nigel Pearson]

> I committed a similar fix using USING_OSS rather than __linux__.

	OK for OS X, but would USING_OSS be defined on a Linux build
which is using ALSA audio output?

	I suspect that it should be:
#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__)

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