Help:test prop WILL_FAIL clarify and example
This makes the WILL_FAIL behavior explicit. Users could be confused because some other build systems treat equivalent test properties as allowing a failure, but still pass on a passing test, and may catch SIGABRT unlike CMake.
Example: C++ uncaught exception is fine on Linux with CTest WILL_FAIL, but macOS makes SIGABRT that makes CTest test fail even with WILL_FAIL.
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Edited by scivision