New comment by Logarithmus on void-packages repository

https://github.com/void-linux/void-packages/pull/25179#issuecomment-700341018

Comment:
@ericonr you can find crates which depend on pcre2-sys
at https://lib.rs/crates/pcre2/rev. AFAIK at the moment none of
them is present in void repositories, but I agree with you that it'd be
better to put this environment variable into rust helper.