python: use locally installed auditwheel

`auditwheel` is a part of manylinux images,
there is no need to create a virtual environment
and install it again.

python/tests/auditwheels.py

@@ -1,19 +0,0 @@
-import os
-import subprocess
-import sys
-
-if __name__ == "__main__":
-    assert len(sys.argv) == 2
-    workspacedir = sys.argv[1]
-    for relpath in os.listdir(workspacedir):
-        if relpath.startswith("deltachat"):
-            p = os.path.join(workspacedir, relpath)
-            subprocess.check_call(
-                [
-                    "auditwheel",
-                    "repair",
-                    p,
-                    "-w",
-                    workspacedir,
-                ],
-            )