Brad King c00a6d3967 MSVC: Do not add /GR to CMAKE_CXX_FLAGS by default ...

The `/GR` flag has been on by default since MSVC cl 14.0 from VS 2005.
Remove it from the default flags to make it easier for projects to pass
`/GR-` themselves to turn it off.

Projects may be using string processing to replace `/GR` with another
flag, so we cannot simply drop it.  Add a policy to drop it in a
compatible way.

Fixes: #21428

2020-11-13 11:46:23 -05:00

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