Ports 02f27a83b44d fixed the ports tree to the C locale so it would work
correctly in environments where users use a locale that isn't compatible
with the C locale, e.g. xx_YY.UTF-8 where [A-Z] includes more than just
upper case letters.  USE_LOCALE was introduced to let ports use another
locale if they needed it.  The C.UTF-8 locale was created later on to be
mostly compatible with the C locale.

Switch the ports tree locale to C.UTF-8 and remove USE_LOCALE.  The
world has moved to Unicode so all ports either require it or know how to
build correctly in a Unicode environment.

PR:		295945
Exp-run by:	antoine

Multithreaded encoding is now possible in libFLAC and through the
flac command line tool.

License tweaks from diizzy.

PR:		284748

After 9fd7ee1cdf6c remove GNU_CONFIGURE_MANPREFIX from my ports.

Approved by:    portmgr (blanket)

Improve the flac tool's handling of foreign metadata on decoding a
file (i.e. restoring the foreign metadata) and add a few features
to the metaflac tool.  Both tools have been vetted with fuzzing,
resulting in numerous small fixes.

All PowerPC-specific code has been removed.

PR:		272185

Reported by:	fuz

As MAINTAINER, I was not given a chance to review this and it likely
introduces gratuitous changes I object to.

This reverts commit f7f2d731c8d9a0cdfce89950e2d387dc07909e30.

PR:	272185

downloads.xiph.org already redirects to ftp.osuosl.org, so the
latter adds no redundancy.

Reported by:	diizzy