[compiler-rt] [Sanitizers] Remove freebsd/netbsd from "posix" file (PR #123269)

[Kyle Lippincott via llvm-commits]

spectral54 wrote:

Interesting, I wonder why I didn't see that. I thought I looked for it. It's pretty clearly been there from the beginning (a742193309db6).  Well I guess I'll abandon this change then :)

I have some freebsd-specific and netbsd-specific changes in later changes in the series, is there a way I can run the test suite as a github action, or do I need to find a VM with freebsd and netbsd to test these with? 

https://github.com/llvm/llvm-project/pull/123269