This was as simple as copying over the libtool patches from libvorbis
and removing now-unneeded Serenity-awareness patches.
Co-authored-by: Tim Schumacher <timschumi@gmx.de>
Add `libmpg123` port, for dependant projects to be able to use it.
This port doesn't include the entire `mpg123` project, just the
`libmpg123` library.