New comment by tornaria on void-packages repository

https://github.com/void-linux/void-packages/pull/33006#issuecomment-922088123

Comment:
Here different semantics for the move step:
```
set -- "$extractdir"/*
if [ "$#" -eq 1 ] && [ -d "$1" ]; then
	mv -i "$1" -T "$wrksrc" ||
		msg_error "$pkgver: failed to move '$1' to '$wrksrc'"
else
	mkdir -p "$wrksrc" || msg_error "$pkgver: failed to create wrksrc.\n"
	mv -i "$@" -t "$wrksrc" ||
		msg_error "$pkgver: failed to move '$extractdir/*' into '$wrksrc'"
fi
```
More precisely:
 - if there's a single directory extracted, move that to XBPS_BUILDDIR renaming to `$wrksrc`
 - otherwise, move the whole tmpdir into XBPS_BUILDDIR with name `$wrksrc`.