COMP: Update inner build external project to use CMAKE_CACHE_ARGS

Unless option have to be passed using the command line, this is the
recommended approach to pass options. It avoids "command line length issues".

CMake/External/CMakeLists.txt

@@ -101,7 +101,7 @@ ExternalProject_Add( ${PROJECT_NAME}
   DOWNLOAD_COMMAND ""
   SOURCE_DIR ${${PROJECT_NAME}_SOURCE_DIR}
   BINARY_DIR ${CMAKE_BINARY_DIR}/Innerbuild
-  CMAKE_ARGS
+  CMAKE_CACHE_ARGS
     -D${PROJECT_NAME}_SUPERBUILD:BOOL=OFF
     -D${PROJECT_NAME}_BUILD_EXAMPLES:BOOL=${${PROJECT_NAME}_BUILD_EXAMPLES}
     -D${PROJECT_NAME}_BUILD_TESTING:BOOL=${${PROJECT_NAME}_BUILD_TESTING}