When installing the php extension with `pecl instal mongodb` the process ends with a failure due to `pcre2.h` not being found.

This happens on monterey 12.5.1 on M1, with PHP 8.1.9 installed by homebrew.

A working workaround is described on https://stackoverflow.com/questions/66496119/pecl-fails-installing-mongodb-driver-on-apple-silicon-m1:

brew install pcre2
ln -s /opt/homebrew/Cellar/pcre2/10.40/include/pcre2.h /opt/homebrew/Cellar/php/8.1.7/include/php/ext/pcre/pcre2.h
pecl install mongodb

But this is likely to break on every release, so a better fix for the pcre dependency is needed.