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Add an INI for configuring the SameSite flag on cookies set by Session.
See also https://bugs.php.net/bug.php?id=72230 for adding this flag to setcookie().
Update to RFC 6265 regarding SameSite (draft): https://tools.ietf.org/html/draft-ietf-httpbis-cookie-same-site-00
SameSite is currently supported by Chrome and Opera: http://caniuse.com/#feat=same-site-cookie-attribute
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Note that there is already a respective RFC (targetting PHP 7.3.0)
in voting phase: <https://wiki.php.net/rfc/same-site-cookie>.
The mentioned RFC has been accepted and implemented, so this
ticket can be closed.