[compiler-rt] Revert "[compiler-rt][XRay] Make `xray_interface.h` C compliant" (PR #141570)

[Jan André Reuter via llvm-commits]

Thyre wrote:

Thanks for the quick revert.
Looks like we triggered an issue unrelated to the PR, see #141598. 
How should we go forward here? Mark the test as unsupported for powerpc64le and try again?

https://github.com/llvm/llvm-project/pull/141570