Log message:
fix minor memory leak in ogg123_comment_set() introduced in previous

Log message:
Add back patch-ac containing various ogg123 playback fixes (different
from the last set), making ogg playback useful:
- implement ogg123_pipe_open() which opens a pipe and runs the command
  supplied in the char **, returning the child pid and fd array from pipe(2).
  based on code from ogg123_child_run().
- replace popen() with ogg123_pipe_open() in ogg123_info_get(),
  ogg123_comment_get(), and ogg123_comment_set().  now info actually
  works for file names which contain wacky shell characters (where
  surrounding the file name with quotes just Isn't Enough)
- parse_bitrate(): current bitrate in ogg123 output is now "(NNN.MM kbps)",
  so look for that rather than "Bitrate: NNNN"
- when setting the initial bit_rate for a song, use "bitrate_average / \ 
1000"
  rather than "bitrate_nominal", since bit_rate is in kbps and bitrate_*
  is in bps and bitrate_average is more appropriate that bitrate_nominal.