Mark Windows mail tests as conflicting

These tests are not (yet) supposed to be run in parallel.

Test standard mail and imap on Windows CI

We setup the currently latest version of hMailServer[1] as mail server,
and configure according to imap_include.inc. To not require further

Test standard mail and imap on Windows CI

We setup the currently latest version of hMailServer[1] as mail server,
and configure according to imap_include.inc. To not require further
configuration, we adapt mail_skipif.inc and mail_include.inc to match
that configuration. However, we also change the default domain to the
reserved `example.com`.

We also update the standard mail tests to use the `--EXTENSIONS--`
section (instead of skipping the tests if ext/imap is not available).

Finally, we fix bug80751.phpt to expect the configured To and Cc mail
addresses.

[1] <https://www.hmailserver.com/>

Closes GH-8357.

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Fix #72964: White space not unfolded for CC/Bcc headers

`\r\n` does only terminate a header, if not followed by `\t` or ` `.
We have to cater to that when determining the end position of

Fix #72964: White space not unfolded for CC/Bcc headers

`\r\n` does only terminate a header, if not followed by `\t` or ` `.
We have to cater to that when determining the end position of the
respective headers.

Closes GH-6420.

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