pw_build: Remove legacy python_wheels

The pw_python_wheels target was replaced by a new and improved
version that lives inside pw_build/python_dist now. Known downstream
usages have been updated to use the new version.

No-Docs-Update-Reason: Docs already updated in previous change
Change-Id: I99f70e5f13d0804dd7b1f15274db00b5ca9c484a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/44145
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Joe Ethier <jethier@google.com>
diff --git a/pw_build/python_wheels.gni b/pw_build/python_wheels.gni
deleted file mode 100644
index 22210da..0000000
--- a/pw_build/python_wheels.gni
+++ /dev/null
@@ -1,34 +0,0 @@
-# Copyright 2020 The Pigweed Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may not
-# use this file except in compliance with the License. You may obtain a copy of
-# the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations under
-# the License.
-
-import("//build_overrides/pigweed.gni")
-
-import("$dir_pw_build/python_action.gni")
-
-# Builds a .whl from a Python package.
-template("pw_python_wheels") {
-  pw_python_action(target_name) {
-    forward_variables_from(invoker, [ "deps" ])
-
-    script = "$dir_pw_build/py/pw_build/python_wheels.py"
-
-    args = [
-      "--out_dir",
-      rebase_path("$target_out_dir/python_wheels"),
-    ]
-    args += rebase_path(invoker.inputs)
-
-    stamp = true
-  }
-}