[clang] [llvm] Prefer std::getenv to ::getenv (PR #108529)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> Okay, thanks for clarifying. Shall I close this one?

I don't see a lot of value in the change, but because it's an NFC and the changes only impact code always compiled as C++ anyway, it's not entirely unreasonable. Personally, I'd close, but it's up to you (if you move ahead with it as an NFC change, be sure to reword the commit title and summary accordingly though).

https://github.com/llvm/llvm-project/pull/108529