tests: use '-4' where needed

Our test servers run either on ipv4 *or* on ipv6, as requested.
A test case using 'localhost' or '*.local' in the url needs to
run with the specific vers

tests: use '-4' where needed

Our test servers run either on ipv4 *or* on ipv6, as requested.
A test case using 'localhost' or '*.local' in the url needs to
run with the specific version of the server started.

Otherwise, curl's "happy eyeball"ing will connect to another
server that may be running due to parallel testing or for some
other reasons.

Note that port reuse here depends on the OS strategy and it
seems netbsd is especially likely to hit this.

Closes #15060

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tests: make precheck for HTTP on 127.0.0.1 into a feature

It can now be required easily in <features> instead of having perl code
in a <precheck>.

Closes #15039

tidy-up: spelling

C89, Schannel, Secure Transport, contractions.

Cherry-picked from #14692
Closes #14996

tests: add Schannel-specific tests and disable unsupported ones

Adds Schannel variants of SSLpinning tests that include the option
--ssl-revoke-best-effort to ignore certificate revocati

tests: add Schannel-specific tests and disable unsupported ones

Adds Schannel variants of SSLpinning tests that include the option
--ssl-revoke-best-effort to ignore certificate revocation check
failures which is required due to our custom test CA certificate.

Disable the original variants if the Schannel backend is enabled.

Also skip all IDN tests which are broken while using an msys shell.

This is a step to simplify test exclusions for Windows and MinGW.

Reviewed-by: Jay Satiro
Reviewed-by: Marcel Raad
Reviewed-by: Daniel Stenberg
Closes #7968

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