HTTPS SNI host name normalization

When setting the host name for HTTPS (here and perhaps here and perhaps elsewhere), it needs to

• remove a trailing dot
• convert the hostname to lowercase

freepascal.org and freepascal.org. might different websites, so it needs to keep the dot for HTTP, but for HTTPS it needs to removed

(see https://daniel.haxx.se/blog/2022/05/12/a-tale-of-a-trailing-dot/ )