[clang] [Driver] Hook up Haiku PowerPC support (PR #69134)

[Fangrui Song via cfe-commits]

MaskRay wrote:

It seems that there is no usable Haiku kernel: https://www.haiku-os.org/guides/building/port_status/ Then we shouldn't add this?

https://github.com/llvm/llvm-project/pull/69134