locale: make posix

Run make posix to generate monetary definition files with the
international parameters missing from localeconv(3)'s lconv struct.

Manually convert the "frozen" non-unicode locales under share/monetdef.

Reviewed by: bapt
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D53917

(cherry picked from commit 9df8243a2e0ab1ef027cbfbcb4105f5f0ce108e1)