[Rpm-maint] [rpm-software-management/rpm] rpmbuild: default to LANG=C.utf8 ? (Issue #2587)

[Neal Gompa]

For what it's worth, I think we should _at least_ consider making a build flag to switch RPM to use `C.UTF-8` instead of `C`, and make our CMake default to it for Linux.

>From my research, it seems that Darwin/macOS does the "interesting" thing of overlaying UTF-8 support to the C locale by doing the following combination: `LANG=C` + `LC_CTYPE=UTF-8`. It's not _wrong_, but I don't think anyone else does it.

FreeBSD has had a `C.UTF-8` locale for a while, but with FreeBSD 13, it is now the default: https://github.com/freebsd/freebsd-src/commit/09ef995baf45333d45ab214daf8c03e1a25f8fcc

OpenBSD has supported `C.UTF-8` in some form for at least ten years, and NetBSD's `C` locale is UTF-8 aware (and `C.UTF-8` is an alias to `C` there).

So at least at this point, the only odd duck is macOS.

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