Mark de Wever 17b0d90e20 [libunwind] Removes CMake work-arounds.
CMake older than 3.20.0 is no longer supported.
This removes work-arounds for no longer supported versions.

Reviewed By: #libunwind, mstorsjo

Differential Revision: https://reviews.llvm.org/D152100
2023-06-05 17:42:37 +02:00
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