Bug #66481 Segfaults on session_name()

If the previous value of session.name was NULL then any call to
session_name($string) would result in a segmentation fault.

This changes the behaviour to set the value of session.name to
"PHPSESSID" if a blank value is given in php.ini or via -d on the
command line. There is already protection against setting it to NULL via
session_name() or ini_set().
Update NEWS
Revert "Update NEWS"

This reverts commit 8f5de8ddcf5fea43928cf2358b95f3de1ab5ade9.
Revert "Bug #66481 Segfaults on session_name()"

This reverts commit 5662ffb295c6f9cb10768d8246f2656aae6b8abb.
Re-fixed Bug #66481 (Calls to session_name() segfault when session.name is null)
forked the test for bug #66481
Fix bug #66509: copy() arginfo incorrect since 5.4

Since 5.4, the ZEND_BEGIN_ARG_INFO_EX was replaced
by non _EX, causing Reflection to assume the
$context parameter is required.
Fix #62479: Some chars not parsed in passwords

This fixes an issue where backslashes and spaces aren't
correctly parsed for passwords.
Enable zend.multibyte tests. Tipcal configuration works, but most tests fail.
Update NEWS for bug fix #62479
fix these tests so they properly clean up after themselves.