Fix for mac c++17 support

Author: drebbe-intrepid

setup.py

@@ -90,9 +90,8 @@ def run(self):
         '-Wno-write-strings',
     ]
 elif 'DARWIN' in platform.system().upper():
-    compile_args = [
-        '-std=c++17',
-    ]
+    # Mac doesn't respect the compiler args, but will append with ARCHFLAGS environment variable
+    os.environ['ARCHFLAGS'] = '-std=c++17'
 else:
     compile_args = []