New review comment by kevcrumb on void-packages repository

https://github.com/void-linux/void-packages/pull/39721#discussion_r1025631273

Comment:
At post_extract, there are two locations where the tarballs are availble:

    /void-packages/hostdir/sources/monero-gui-0.18.1.2/rapidjson-129d19ba7f496df5e33658527a7158c79b99c21c.tar.gz
    /host/sources/monero-gui-0.18.1.2/rapidjson-129d19ba7f496df5e33658527a7158c79b99c21c.tar.gz

`$wrksrc` is `/builddir/monero-gui-0.18.1.2`