NVCC flags --compiler-options and -Xcompiler not recognised as equivalent

( As detailed at StackOverflow. )

I found that if I pass MSVC compiler options through NVCC using -Xcompiler, these are consolidated with other -Xcompiler options by CMake. For example, if I supply a Warning level of /W4, this overrides any default, eg /W3. If I supply the same option using --compiler-options, the default is not overridden, which can lead to complaints from the underlying compiler.

--compiler-options <options>,...           (-Xcompiler)
        Specify options directly to the compiler/preprocessor.

Tested on Windows

Microsoft (R) C/C++ Optimizing Compiler Version 19.16.27027.1 for x86
cmake version 3.15.4

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