Use AUDITWHEEL_PLAT variable

manylinux images set AUDITWHEEL_PLAT variable
which is used as a default --plat value by auditwheel.

python/tests/auditwheels.py

@@ -1,12 +1,10 @@
 import os
-import platform
 import subprocess
 import sys
 
 if __name__ == "__main__":
     assert len(sys.argv) == 2
     workspacedir = sys.argv[1]
-    arch = platform.machine()
     for relpath in os.listdir(workspacedir):
         if relpath.startswith("deltachat"):
             p = os.path.join(workspacedir, relpath)
@@ -17,7 +15,5 @@ if __name__ == "__main__":
                     p,
                     "-w",
                     workspacedir,
-                    "--plat",
-                    "manylinux2014_" + arch,
                 ]
             )

python/tox.ini

@@ -28,6 +28,10 @@ deps =
 [testenv:auditwheels]
 skipsdist = True
 deps = auditwheel
+passenv =
+    AUDITWHEEL_ARCH
+    AUDITWHEEL_PLAT
+    AUDITWHEEL_POLICY
 commands = 
     python tests/auditwheels.py {toxworkdir}/wheelhouse