Make audioproc output files be written to output dir by default.
Make audioproc output files be written to output dir by default.

This makes the following files be written into the output dir instead of
the current working dir:
* out.pcm
* vad_out.dat
* ns_prob.dat

TEST=out/Debug/audioproc -aecm -ns -agc --fixed_digital --perf -pb
resources/audioproc.aecdump
All trybots passing.
BUG=none

Review URL: https://webrtc-codereview.appspot.com/1003005

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@3302 4adac7df-926f-26a2-2b94-8c16560cd09d

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