[CMake] Ninja also does not need this setting.

CMakeLists.txt

@@ -6,7 +6,7 @@ cmake_policy(SET CMP0054 NEW)
 cmake_policy(SET CMP0071 NEW)
 cmake_policy(SET CMP0074 NEW)
 
-if(MSVC)
+if(MSVC AND NOT ${CMAKE_GENERATOR} STREQUAL Ninja)
     # Force 64-bit VS compiler
     set(CMAKE_GENERATOR_TOOLSET host=x64)
 endif()