[compiler-rt][XRay] Make `xray_interface.h` C compliant (#140068) The XRay interface header uses no C++ specific features aside from using the `std` namespace and including the C++ variant of C headers. Yet, these changes prevent using `xray_interface.h` in external tools relying on C for different reasons. Make this header C compliant by using C headers, removing the `std` namespace from `std::size_t` and guard `extern "C"`. To make sure that further changes to not break the interface accidentally, port one test from C++ to C. This requires the C23 standard to officially support the attribute syntax used in this test case. Note that this only resolves this issue for `xray_interface.h`. `xray_records.h` is also not C compliant, but requires more work to port. Fixes #139902 Signed-off-by: Jan André Reuter <j.reuter@fz-juelich.de>
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