Change/remove tests that no longer work with YARA 4.1.0
Change/remove tests that no longer work with YARA 4.1.0

Exceeding YR_MAX_STRING_MATCHES no longer raises an error, so we
inject an error via the callback. However, this does not influence the
values returned by GetLastError{Rule,String}.

hillu/go-yara,hillu/go-yara,VirusTotal/go-yara