PHP Firebird 6.1.1-RC.1

⚠️ Release candidate. Please test thoroughly and report any issues.

Changes since v6.1.1-RC.0

• New function ibase_get_client_version()
• Don't depend on fb_get_master_interface() and fb_get_statement_interface() at compile time. Rather dynamically check if fbclient has them.
• Bunch of smaller fixes