New comment by gt7-void on void-packages repository

https://github.com/void-linux/void-packages/pull/29645#issuecomment-803510437

Comment:
> Can you confirm this fixed the issue you were experiencing? Should probably verify by building on a machine with AVX available and transferring to the other.

Yes, I built the package on a skylake, installed it on nehalem, and it works.

> I'd consider using GENERIC for all DYNAMIC_ARCH builds, if applicable.

I didn't want to touch the other archs because I don't have hardware to test. But since the other arches all set `TARGET` to some value, at least the output will not depend on the machine it's compiled on. Also, `TARGET=ARMV8` looks generic enough.