New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/31377#issuecomment-858192657

Comment:
> context?


Some packages require tzdata to testing, however, adding `tzdata` to
those checkdepends will break masterdir, since `tzdata` provides
`/usr/share/zoneinfo/UTC`, hence, it will be removed upon cleanup.

Let's add `tzdata` into `base-chroot` and remove the shenanigan in
`chroot.sh`.