[MPlayer-dev-eng] Suggested argument to pcm output: wavekeeptime

[ed at catmur.co.uk]

Currently the aopcm audio output plugin dumps audio as fast as it can. 

This patch introduces a command line argument to make the plugin dump at
1:1 speed, thus giving greater consistency with other audio output
plugins.

It uses code from the null plugin for timing, and also drops frames if
poll() reports that writing would block.

It includes patches to handle an argument '-wavekeeptime' and report to
stdout the existence of the argument when -ao pcm is chosen. I have not
written docs patches.

Example: mplayer doom3_e32003.mpg -ao pcm -wavekeeptime -aofile
/dev/fd/3 3>&1 >&2 | cat | cat | cat | cat | aplay -f cd
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