[php-src] PR #25209: Fix dangling context in ldap_set_rebind_proc()

Pull Request: https://github.com/php/php-src/pull/25209 Author: lacatoire ldap_set_rebind_proc() passed a pointer to its own argument slot as the callback context, which is stale once a referral is chased later. Pass the ldap_linkdata instead. ### To reproduce With a server answering dc=ref with a referral: ```php <?php function cb($conn, $url) { echo "callback: ", get_class($conn), " $url\n"; return 0; } function setup($l) { ldap_set_rebind_proc($l, 'cb'); } function deeper($l, $d) { return $d > 0 ? deeper($l, $d - 1) : ldap_read($l, "dc=ref", "(objectClass=*)", ["cn"]); } $l = ldap_connect("ldap://127.0.0.1:3899"); ldap_set_option($l, LDAP_OPT_PROTOCOL_VERSION, 3); ldap_bind($l); ldap_set_option($l, LDAP_OPT_REFERRALS, 1); setup($l); var_dump(deeper($l, 6)); ``` Before (ASAN build): SEGV in _ldap_rebind_proc After: callback: LDAP\Connection ldap://localhost:3899/dc=x