Add placeholder CUDA json flag tables

Generate json flag tables from initial placeholder headers

Original header commit v3.9.0-rc1~431^2~10

The CUDA Toolkit's VS integration defines abstractions for both options
to `nvcc` and options to pass through `-Xcompiler` to the host MSVC.
We need a separate flag table to parse each set of flags into the
corresponding abstractions.  Add empty placeholders for these tables.

Templates/MSBuild/FlagTables/v10_Cuda.json

@@ -0,0 +1,2 @@
+[
+]

Templates/MSBuild/FlagTables/v10_CudaHost.json

@@ -0,0 +1,2 @@
+[
+]