Windows: without libintl use LC_CTYPE instead of LC_MESSAGES

If libintl is not available, LC_MESSAGES is not defined. For now fallback to
using LC_CTYPE.

Neovim and Vim have diverged significantly in ex_cmds2.c concerning this logic.
In other locations the fallback is actually LC_COLLATE, but in this case Vim
calls get_mess_env() (which in turn falls back to LC_CTYPE).

In Neovim get_mess_env() is only available with libint. This means we are not
completely consistent with Vim when handling LC_ environment variables and do
not build against libintl.

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