mkarchiso: remove workaround for glibc < 2.39
Starting with glibc 2.39, LC_ALL=C.UTF-8 overrides LANGUAGE, just like LC_ALL=C. See https://sourceware.org/bugzilla/show_bug.cgi?id=16621 for details.
This reverts commit 6ac22309.
Edited by nl6720
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Starting with glibc 2.39, LC_ALL=C.UTF-8 overrides LANGUAGE, just like LC_ALL=C. See https://sourceware.org/bugzilla/show_bug.cgi?id=16621 for details.
This reverts commit 6ac22309.