urlapi: add CURLU_NO_GUESS_SCHEME #13616
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Used for extracting:
when used asking for a scheme, it will return CURLUE_NO_SCHEME if the stored information was a guess
when used asking for a URL, the URL is returned without a scheme, like when previously given to the URL parser when it was asked to guess
as soon as the scheme is set explicitly, it is no longer internally marked as guessed
The idea being:
allow a user to figure out if a URL's scheme was set as a result of guessing
extract the URL without a guessed scheme
this makes it work similar to how we already deal with port numbers
Extend test 1560 to verify.