support pure wheels in shim packages (#75)

_shim_setup.py

@@ -43,9 +43,14 @@ class InstallPrebuilt(build_py):
       if plat is None:
         raise RuntimeError(f"unsupported platform: {key}")
 
-      whl_name = f"{MODULE}-{VERSION}-py3-none-{plat}.whl"
+      whl_names = [
-      url = f"{REPO_URL}/releases/download/{TAG}/{whl_name}"
+        f"{MODULE}-{VERSION}-py3-none-{plat}.whl",
+        f"{MODULE}-{VERSION}-py3-none-any.whl",
+      ]
 
+      raw = None
+      for whl_name in whl_names:
+        url = f"{REPO_URL}/releases/download/{TAG}/{whl_name}"
         print(f"Downloading {url} ...")
         for attempt in range(3):
           try:
@@ -53,10 +58,14 @@ class InstallPrebuilt(build_py):
             break
           except (URLError, OSError) as e:
             if attempt == 2:
+              if whl_name == whl_names[-1]:
                 raise
+              break
             wait = 2 ** attempt
             print(f"Download failed ({e}), retrying in {wait}s ...")
             time.sleep(wait)
+        if raw is not None:
+          break
 
       print(f"Extracting {DATADIR} ...")
       with zipfile.ZipFile(BytesIO(raw)) as zf: