[llvm] [Lit] Change processRedirects to open all files in binary mode (PR #194368)

[Sean Perry via llvm-commits]

perry-ca wrote:

Hi, this change is causing major problems (~1500 failures) for z/OS.  Please revert or find a better way to solve the problem.

I'm available if you need a hand.  Thanks

https://github.com/llvm/llvm-project/pull/194368