multi3d compilation on windows?

Author: Teseo Schneider

setup.py

@@ -61,6 +61,7 @@ def build_extension(self, ext):
             if sys.maxsize > 2**32:
                 cmake_args += ['-A', 'x64']
             build_args += ['--', '/m']
+            build_args += ['--', '/MP']
         else:
             cmake_args += ['-DCMAKE_BUILD_TYPE=' + cfg]
             build_args += ['--', '-j2']