remove march=native option that does not work on Apple M1

Author: yoshoku

setup.py

@@ -1,5 +1,6 @@
 import os
 import sys
+import platform
 
 import numpy as np
 import pybind11
@@ -82,6 +83,8 @@ class BuildExt(build_ext):
     }
 
     if sys.platform == 'darwin':
+        if platform.machine() == 'arm64':
+            c_opts['unix'].remove('-march=native')
         c_opts['unix'] += ['-stdlib=libc++', '-mmacosx-version-min=10.7']
         link_opts['unix'] += ['-stdlib=libc++', '-mmacosx-version-min=10.7']
     else: