use ninja if possible

Author: rusty1s

setup.py

@@ -76,8 +76,7 @@ def get_extensions():
     tests_require=tests_require,
     ext_modules=get_extensions() if not BUILD_DOCS else [],
     cmdclass={
-        'build_ext':
-        BuildExtension.with_options(no_python_abi_suffix=True, use_ninja=False)
+        'build_ext': BuildExtension.with_options(no_python_abi_suffix=True)
     },
     packages=find_packages(),
 )