opus - Mar 2013 - [PATCH] opusfile: Fix invalid pkg-config files on MinGW

Hi,
please find attached two patches for opusfile:
1. Fix invalid pkg-config files on MinGW.
2. (trivial) Add some files to .gitignore.

Two other random things I noticed:
- The API reference for libopusfile linked from  
http://opus-codec.org/docs/ is for version 0.1.
- The pkg-config files say "Description: Opus playback library". Well,
the library doesn't do playback, does it? Perhaps it should be changed  
to "decoder" or similar.

Ulrich
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