[PATCH v3 0/2] MR6455: kernelbase: Make EnumSystemLocalesA/W behave more according to documentation

[Michael Ehrenreich (＠mickdermack)]

[Documentation for EnumSystemLocalesA/W](https://learn.microsoft.com/en-us/windows/win32/api/winnls/nf-winnls-enumsys...) says "If [`LCID_ALTERNATE_SORTS`] is used with either `LCID_INSTALLED` or `LCID_SUPPORTED`, the installed or supported locales are retrieved, **as well as** the alternate sort locale identifiers." (emphasis mine).

Until now, Wine *only* returned alternate sorts in this case, which apparently breaks some versions of NexusDB.

This MR fixes the issue and adds some basic tests to ensure the issue isn't accidentally re-introduced at a later time.

--
  v3: Add basic tests for EnumSystemLocalesA/W
      Fix EnumSystemLocalesA/W filtering of default/alternate sort orders.

https://gitlab.winehq.org/wine/wine/-/merge_requests/6455