[compiler-rt] [compiler-rt/darwin] Disable building sanitizers on platforms without fork(). (PR #83485)

[James Y Knight via llvm-commits]

jyknight wrote:

I think you can use sanitizer libs you build...can't you?

W.r.t. fork/exec, certainly it is denied by the kernel at runtime on any "normal" i/tv/watch OS device, but I suspect it probably works fine in the simulator. Don't know whether that gets used in practice or not.

https://github.com/llvm/llvm-project/pull/83485