Log Message:
Update audio/flac to 1.0.3.  Changes from version 1.0.2 include:

- Use buildlink2.
- Fix build with newer libtool with tagged configuration.
- Move HTML documention into the proper location under doc/html.

* Bug fixes.
* 24-bit input support restored in flac.
* Decoder speedup in libFLAC, which is directly passed on to the
  command-line decoder and plugins.
* New -F option to flac to continue decoding in spite of errors.
* New VORBIS_COMMENT metadata block for tagging with Vorbis-style comments.
* Vastly improved metaflac, now with many editing and tagging options.
* Note: new semantics for -P option in flac.
* Note: removed -R option in flac.
* New metadata interface to libFLAC for manipulating metadata in FLAC files.
* New libFLAC++ API, an object wrapper around libFLAC.
* Customizable metadata filtering by type in decoders.
* Stream encoder can take an arbitrary list of metadata blocks, instead
  of just one SEEKTABLE and/or PADDING block.