media-sound/beets: Remove USE flac,ogg,opus; fix USE gstreamer

media-sound/beets: Remove USE flac,ogg,opus; fix USE gstreamer

They were effectively only used if USE +replaygain +gstreamer were enabled,
not ticking any build switches but purely forwarding USE dependencies.
Depend on media-plugins/gst-plugins-meta instead.

gstreamer is also being used if USE +mpd.

Reviewed-by: Mart Raudsepp <leio@gentoo.org>
Quote:
replaygain uses decodebin, thus should depend on
media-plugins/gst-plugins-meta:1.0 to pull in any decided by user decoders.
It uses rganalysis explicitly, for which it needs to depend on
media-libs/gst-plugins-good:1.0. Other explicitly used elements are all
from core or base, thus the gst-plugins-meta dep will cover it, or you can
be explicit (core = media-libs/gstreamer).

Additionally there is beetsplug/bpd/gstplayer.py that uses playbin. I don't
know what that thing is about, but it seems irrelevant to replaygain, so
might want a gstreamer? ( media-plugins/gst-plugins-meta:1.0 ) independent
of USE=replaygain, if it's optional enough to work fine without it
installed without losing anything important.

Package-Manager: Portage-2.3.49, Repoman-2.3.10