hide RAFT #pragma deprecation warnings (rapidsai#114)

Define `-DRAFT_HIDE_DEPRECATION_WARNINGS` added in rapidsai#2271.

Authors:
  - Paul Taylor (https://github.com/trxcllnt)
  - Corey J. Nolet (https://github.com/cjnolet)

Approvers:
  - Corey J. Nolet (https://github.com/cjnolet)

URL: rapidsai/cuvs#114

cpp/cmake/modules/ConfigureCUDA.cmake

@@ -13,8 +13,8 @@
 # =============================================================================
 
 if(DISABLE_DEPRECATION_WARNINGS)
-  list(APPEND CUVS_CXX_FLAGS -Wno-deprecated-declarations)
-  list(APPEND CUVS_CUDA_FLAGS -Xcompiler=-Wno-deprecated-declarations)
+  list(APPEND CUVS_CXX_FLAGS -Wno-deprecated-declarations -DRAFT_HIDE_DEPRECATION_WARNINGS)
+  list(APPEND CUVS_CUDA_FLAGS -Xcompiler=-Wno-deprecated-declarations -DRAFT_HIDE_DEPRECATION_WARNINGS)
 endif()
 
 # Be very strict when compiling with GCC as host compiler (and thus more lenient when compiling with