VS: Improve workaround for CUDA -Xcompiler placement bug
In commit v3.9.0-rc1~431^2~6 (VS: Place CUDA host compiler options in proper project file fields, 2017-03-07) we worked around a bug in the CUDA VS integration by dropping `AdditionalCompilerOptions`. However, this silently drops `-Xcompiler=` options given by the user that don't map to one of CudaCompile's dedicated settings. Improve the workaround to instead put the remaining `AdditionalCompilerOptions` into the `AdditionalOptions` field behind `-Xcompiler=` ourselves.
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