NaturalCompare: implement using locale kit

The non-locale aware version is kept in src/build/libshared for use on
the host system and in packagefs (kernel add-on). In both cases, ICU is
not availabl

NaturalCompare: implement using locale kit

The non-locale aware version is kept in src/build/libshared for use on
the host system and in packagefs (kernel add-on). In both cases, ICU is
not available.

Fixes #8192

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