WP PHP RV v160910.71271

• Adding src/includes/os-utils.php.
• Adding src/includes/php-utils.php.
• Adding src/includes/versions.php.
• Adding ___wp_php_rv_get_php_version().
• Minor enhancements in wp_php_rv_notice().
• Minor enhancements in ___wp_php_rv_notice_brand_name().
• Removing very old (already-deprecated) function wp_php_rv_custom_notice() entirely. You should be using wp_php_rv_notice() instead please.
• Remove unused filter wp_php_rv_notice_refs_before_markup.
• Remove unused filter wp_php_rv_notice_refs.
• New filter: wp_php_rv_notice_markup.