Turn off CUDA deprecation warnings until addressed

As mentioned in issue PixarAnimationStudios#997, OpenSubdiv still uses CUDA functionality
that is being deprecated.  When warnings are treated as errors, this
can make OpenSubdiv fail to compile.  For now, we turn off these
deprecation warnings until we can address them.

CMakeLists.txt

@@ -507,6 +507,7 @@ endif()
 if(CUDA_FOUND)
     add_definitions(
         -DOPENSUBDIV_HAS_CUDA
+        -DCUDA_ENABLE_DEPRECATED=0
     )
     set(OSD_GPU TRUE)