Update windows.php.net links to https

[jordikroon]

Replacements done by:

find . -path ./.git -prune -o -type f -print0 \                                                                                                                                      
| xargs -0 perl -pi -e 's{http://windows\.php\.net}{https://windows.php.net}g'

[derickr]

windows.php.net is going to go away soon, so these links and text probably should be updated to point to https://downloads.php.net/~windows/releases/ instead.