The perl build's attempt to escape spaces and such in LD_LIBRARY_PATH is _SAD_.

It uses a sed expression that assumes you can escape - to use it as a literal
(you can't, it has to be first or last char of the range), and assumes
you have to escape delimiters in sed [] context (you don't), and/or that
non-printf escapes become the literal character (they don't, the backslash
is preserved as a literal), meaning it winds up doing "s/[\-\]//" which is
a length 1 range, which is officially undefined behavior according to posix,
and regcomp errors out.

But if we don't accept it (like other implementations do) the perl build
breaks. So collapse [A-A] into just [A].

Testcae taken from perl 5.22.0 file Makefile.SH line 8.

(While we're at it, remove an unused argument from a function.)

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