[clang] [AIX] Fix AIX BuildBot failure as AIX linker doesn't support version script. (PR #117342)

[Aaron Puchert via cfe-commits]

aaronpuchert wrote:

Doesn't eaa0a21d21962280dc2c03a09152510f6162a576 already fix this? If `CMAKE_SYSTEM_NAME` is `Linux`, it can probably not be `AIX` at the same time, right? See also the discussion on #116556.

Do you mind if I revert this?

https://github.com/llvm/llvm-project/pull/117342