New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/issues/22139#issuecomment-631167258

Comment:
Working on it, I think a hook is no-good.
There's other places reference to `$XBPS_CROSS_BASE`,
I still need to inspect `$DESTDIR`to find the leftover.

A warning if `grep -q "$XBPS_CROSS_BASE" "$PKGDESTDIR"` maybe better?

Thanks for the list anyway.