[clang] [clang][NFC] Suppress octal literal warnings in system macros via TableGen (PR #228035)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> Do we need to modify the warnings related to binary literals? @AaronBallman

I think so, but in a separate PR

https://github.com/llvm/llvm-project/pull/228035