Log message:
wip/sox is no longer needed since audio/sox has been updated

Log message:
Bump PKGREVISION for libpng shlib name change.
Also add some patches to remove use of deprecated symbols and fix other
problems when looking for or compiling against libpng-1.4.x.

Log message:
Import sox-14.2.0 as wip/sox.

sox translates sound samples between different file formats,
and performs various sound effects.

This release understands "raw" files in various binary formats,
raw textual data,
Sound Blaster .VOC files, IRCAM SoundFile files, SUN Sparcstation
.au files, mutant DEC .au files, Apple/SGI AIFF files,
CD-R (music CD format), Macintosh HCOM files, Sounder files,
NeXT .snd files, SUN ADPCM (compressed) .au files,
and Soundtool (DOS) files.

The sound effects include changing the sample rate, adding echo
delay lines, applying low-, high, and band-pass filtering,
reversing a sample in order to search for Satanic messages,
and the infamous Fender Vibro effect.