There is a new pull request by sgn against master on the void-packages repository

https://github.com/sgn/void-packages retire-XBPS_PKGDESTDIR
https://github.com/void-linux/void-packages/pull/31772

xbps-src: retire XBPS_PKGDESTDIR
Historically, PKGDESTDIR was only set during pkg_install, and
XBPS_PKGDESTDIR was set to indicate that we're in subpkg's
pkg_install.

However, from 0b95cb8f5d, (Merge xbps-src code to make it usable in
a standalone mode., 2014-03-22), PKGDESTDIR is always set,
regardless of states.

Let's drop all usages of XBPS_PKGDESTDIR.

While we're at it, error out of vmove is used outside of subpkg.

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#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [ ] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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A patch file from https://github.com/void-linux/void-packages/pull/31772.patch is attached