Fix the CMake option for disabling deprecation warnings. (rapidsai#4946)

The actual option is `DISABLE_DEPRECATION_WARNINGS` but everywhere in the code base is currently making use of `DISABLE_DEPRECATION_WARNING` (note the singular rather than the plural).

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - Robert Maynard (https://github.com/robertmaynard)

URL: rapidsai#4946

build.sh

@@ -74,7 +74,7 @@ CUML_EXTRA_PYTHON_ARGS=${CUML_EXTRA_PYTHON_ARGS:=""}
 NVTX=OFF
 CCACHE=OFF
 CLEAN=0
-BUILD_DISABLE_DEPRECATION_WARNING=ON
+BUILD_DISABLE_DEPRECATION_WARNINGS=ON
 BUILD_CUML_STD_COMMS=ON
 BUILD_CUML_TESTS=ON
 BUILD_CUML_MG_TESTS=OFF
@@ -182,7 +182,7 @@ while true; do
             NVTX=ON
             ;;
         --show_depr_warn )
-            BUILD_DISABLE_DEPRECATION_WARNING=OFF
+            BUILD_DISABLE_DEPRECATION_WARNINGS=OFF
             ;;
         --codecov )
             CUML_EXTRA_PYTHON_ARGS="${CUML_EXTRA_PYTHON_ARGS} --linetrace=1 --profile"
@@ -257,7 +257,7 @@ if completeBuild || hasArg libcuml || hasArg prims || hasArg bench || hasArg pri
           -DCUML_USE_TREELITE_STATIC=${BUILD_STATIC_TREELITE} \
           -DNVTX=${NVTX} \
           -DUSE_CCACHE=${CCACHE} \
-          -DDISABLE_DEPRECATION_WARNING=${BUILD_DISABLE_DEPRECATION_WARNING} \
+          -DDISABLE_DEPRECATION_WARNINGS=${BUILD_DISABLE_DEPRECATION_WARNINGS} \
           -DCMAKE_PREFIX_PATH=${INSTALL_PREFIX} \
           -DCMAKE_MESSAGE_LOG_LEVEL=${CMAKE_LOG_LEVEL} \
           ${CUML_EXTRA_CMAKE_ARGS} \

cpp/cmake/modules/ConfigureCUDA.cmake

@@ -30,7 +30,7 @@ if(CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL 11.2.0)
 endif()
 list(APPEND CUML_CUDA_FLAGS -Xcompiler=-Wall,-Werror,-Wno-error=deprecated-declarations,-Wno-error=sign-compare)
 
-if(DISABLE_DEPRECATION_WARNING)
+if(DISABLE_DEPRECATION_WARNINGS)
     list(APPEND CUML_CXX_FLAGS -Wno-deprecated-declarations)
     list(APPEND CUML_CUDA_FLAGS -Wno-deprecated-declarations -Xcompiler=-Wno-deprecated-declarations)
 endif()