pcre not ready at mbstring startup

### Description

A simple `php -v` raise error message

`PHP Warning:  PHP Startup: ^(text/|application/xhtml\+xml) (offset=0): unrecognised compile-time option bit(s) in Unknown on line 0`

This seems to be a quite rare run condition, when **mbstring** is initialized (and `mbstring.http_output_conv_mimetypes` value) before **pcre**.


### PHP Version

PHP 8.0

### Operating System

Linux