Removes use of get_magic_quotes_gpc()

[mikeschinkel]

As get_magic_quotes_gpc() has been removed in PHP 8.0, this PR removes it from the clean() function in layout.inc.

Hopefully its removal is valid, or at least how it was removed it valid.

[mikeschinkel]

@tiffany-taylor — This PR should fix the mailing list submit form problem, assuming it is acceptable security wise?

(I haven't had to deal with much magic quotes/strip slashes code in PHP so I am not 100% sure if what I did is ok.)

Also, here is the email I sent to the php.webmaster list referencing this PR:

https://news-web.php.net/php.webmaster/29448

[tiffany-taylor]

I will try to review this over the weekend. My computer is unplugged at present, but I'll be hooking it back up if not tomorrow, then by Saturday.

[mikeschinkel]

Thanks @tiffany-taylor.

Actually thanks to @ramsey's email I looked again and don't think this was it, although this is needed.

Instead I think it was using HTTP for the URL instead of HTTPS. Here's the PR for that.

[cmb69]

This change is still needed for PHP 8 compatibility, and causes no issues if the server is running PHP 5.4+ (what I guess it does). The space in front of $var should be removed though.

[mikeschinkel]

@cmb69 — Space removed.

[cmb69]

Thank you!