David Rohr d5895f50c3 CMakeDetermineCompilerABI: Avoid failing on warnings with -Werror ...

Simply remove `-Werror` flags from `CMAKE_<LANG>_FLAGS` to avoid failing
ABI detection if there happen to be warnings in the test project.  For
example, `-Wunused-command-line-argument` warnings are common since the
ABI detection project may not exercise all the flags passed by users.

Fixes: #20305

2020-02-03 17:01:35 -05:00

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