if a port needs 2.x then set MODPY_VERSION=${MODPY_DEFAULT_VERSION_2}.
This commit doesn't change any versions currently used; it may be that
some ports have MODPY_DEFAULT_VERSION_2 but don't require it, those
should be cleaned up in the course of updating ports where possible.
Python module ports providing py3-* packages should still use
FLAVOR=python3 so that we don't have a mixture of dependencies some
using ${MODPY_FLAVOR} and others not.
(mp3gain has various vulnerabilities due to a buggy old fork of mpg123's
decoder, additionally is mp3-only, whereas this handles more formats).
See various posts at http://www.openwall.com/lists/oss-security/2017/09/14/
----
ReplayGain is designed to solve the problem of varying volumes between
different audio files. This package provides Python modules and scripts
to read, write and calculate Replay Gain on various file formats (Ogg
Vorbis, flac, WavPack, MP4, MP3).
----
