mdist: correctly detect dirty hg repos with non-English locale, redux

https://www.gnu.org/software/gettext/manual/html_node/The-LANGUAGE-variable.html

GNU Gettext defines a feature, whereby for translation purposes, if
LC_ALL / LANG are *not* set to C, but rather define an active
translation, the LANGUAGE variable can be used to specify fallback
languages in a colon-separated list wherein the first option is the
primary language and the rest are fallbacks.

CPython, instead, checks the LANGUAGE variable first, and the first
variable that has a non-null value is treated as the canonical language
specification, splitted, and iterated over. LC_ALL=C is therefore
totally ignored, which is a major problem, and the variables aren't
checked for consistency, which is a less major problem.

GNU libc documents the same behavior CPython does -- which is broken as
it makes LC_ALL=C useless.

POSIX issue 8 standardizes on option 3: do like GNU Gettext, except do
not require the primary language in $LANGUAGE to be consistent with LANG
/ LC_ALL.

Thus, we sanitize the environment even harder. What an absolute
disaster. Even if this was fixed tomorrow we would need to maintain this
hack until 2030.

Bug: https://bugs.gentoo.org/936670

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