Allow to use libunwind on Windows #3186
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This change adapts libunwind sources to allow for compilation on Windows - which should fix some of the issues related to empty expectation stack traces which were using build Windows build-in tools. The sources have been adapted to silence warnings and fixes allowing for compilation without CMake config (used in the upstream LLVM project)
This PR should be rebased on top of #3180 and hopefully also tested on Cygwin/MSys2 when it would be available in our CI workflow