[libc-commits] [libc] [libc] Add program_invocation(_short)_name and tweak err.h functions (PR #212448)

[Pavel Labath via libc-commits]

labath wrote:

@kaladron is OOO this month. Would someone from @llvm/reviewers-libc  be able to take a look at this and help me finish this review?

https://github.com/llvm/llvm-project/pull/212448