vpx{enc,dec}: add --help
only output short usage to stderr on error, with --help use stdout Change-Id: I7089f3bca829817e14b14c766f4f3eaee6f54e5c
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only output short usage to stderr on error, with --help use stdout Change-Id: I7089f3bca829817e14b14c766f4f3eaee6f54e5c