[clang] [clang][analyzer] Teach the BlockInCriticalSectionChecker about O_NONBLOCK streams (PR #127049)

[Balazs Benics via cfe-commits]

steakhal wrote:

> LLVM Buildbot has detected a new failure on builder `clang-cmake-x86_64-avx512-win` running on `avx512-intel64-win` while building `clang` at step 6 "ninja check 1".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/81/builds/4823

This doesn't seem to be relevant.

https://github.com/llvm/llvm-project/pull/127049