[libc-commits] [libc] Use execve syscall wrapper in execv.cpp (PR #223181)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google approved this pull request.

LGTM, please add `[libc]` to the title and a proper description before merging.

https://github.com/llvm/llvm-project/pull/223181