New comment by ifreund on void-packages repository

https://github.com/void-linux/void-packages/pull/34724#issuecomment-1024967887

Comment:
I just released a new version of `dumb_runtime_dir` that uses `pkg-config` at the request of a user. Diffing the 1.0.1 and 1.0.2 binaries produced by xbps-src showed no difference. 

~~Using pkg-config to link pam has highlighted something weird about our pam packaging though, the `.pc` files are in the `pam` package instead of `pam-devel`. If you like I'd be happy to move them as part of this PR.~~ 

This PR also moves the PAM pkgconfig files to the `pam-devel` package where they belong.