libarchive: add fallback for systems without C.UTF-8 #6683
Merged
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Suggested in IRC as a possible fix to #5759 and #6488. Currently libarchive uses C.UTF-8 as a locale, but that is debian specific and thus broken on other linux distros and macOS. This PR leaves C.UTF-8 as the default, but falls back to LC_CTYPE which should just use the environment variable of the current system. Of course, this also supersedes #6438 and #6268.
I agree that my changes can be relicensed to LGPL 2.1 or later.