There's a merged pull request on the void-packages repository

php: fix cross build
https://github.com/void-linux/void-packages/pull/22019

Description:
Dynamic loading of extensions was disabled,
because configure cannot determine if dlopen
is available (executes test program).
Override this test by using values taken
from a native build.

closes #21982 and closes #21852 

Did a short test run on armv7l, extensions are now found.
The short test one-liner from #21852
 `php -r 'new SQLite3("db");'` 
works, too.