Parse codec options in order of occurrence.

Each time a codec is enabled or disabled with the umbrella
--enable-vpN flag, set the encoder and decoder configurations as well.
This was done as a post-processing step but doing that lost the order of
the arguments.

BUG=webm:1205

Change-Id: Ic629bfdd06acc04bc5a7227309f36bba54dad8b1
2 files changed