VS: Fix support for CUDA flags in a few cases

Brad Kingrequested to merge
brad.king/cmake:vs-cuda-fix-flags into master

We accidentally left out target_compile_options flags for CUDA in the VS generator. Fix them.

Also improve our workaround for a CUDA VS integration bug that puts -Xcompiler= in the wrong place on command lines. Instead of dropping the flags, put them in a different place ourselves.

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