[vim/vim] MS-Windows: ":language messages" only works once (PR #20862)

```
Problem:  On MS-Windows ":language messages" has no effect once messages
          have been translated, the previous language keeps being used.
Solution: Make gettext drop the translations it cached.
```

related: #18622

That report is mainly about the 32-bit build, which is a different problem.
The "only some messages change language" part of it is what this fixes.

No test is added: gettext() with a domain argument calls textdomain(), which
increments _nl_msg_cat_cntr by itself, so test_gettext_utf8.vim passes even
without this fix although it does switch the message language twice.  Testing
this without a domain argument would need a catalog for the VIMPACKAGE domain,
which bindtextdomain() refuses.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20862

-- Commit Summary --

  * MS-Windows: ":language messages" only works once

-- File Changes --

    M src/locale.c (4)
    M src/os_win32.c (7)
    M src/vim.h (1)

-- Patch Links --

https://github.com/vim/vim/pull/20862.patch
https://github.com/vim/vim/pull/20862.diff

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