New review comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/39984#discussion_r997535270

Comment:
```suggestion
	vbin build/tetgen
	vinstall build/libtet.a 644 usr/lib
	vlicense LICENSE
```
unfortunately, the cmake files don't define an install phase, so we have to override `do_install`

most build phases run in `$wrksrc` so we can simplify