audio/strawberry: Update to 1.1.0

Unflavorize. With this new minor release of Strawberry, now seems to be
the most appropriate time to drop local Qt5 support. Qt5 has enjoyed an
incredibly good run, but it's well past time to start welcoming Qt6 into
our lives.

Iconv support has been dropped upstream, so the UNICODE options have
been subsequently removed and a hard dependency on devel/icu has been
added. ICU has been the default ever since the options were introduced,
so hopefully no big surprises there.

Remove bad URL from MASTER_SITES and update LICENSE (file headers
indicate GPL 3.0 or higher).

https://github.com/strawberrymusicplayer/strawberry/releases/tag/1.1.0