Revert "pw_toolchain: Fix copying on Windows"

This reverts commit 4b3fcb5114fd69077d2923357424ca82354bf140.

Reason for revert: Typo'd the path, and alink needs to delete first.

Original change's description:
> pw_toolchain: Fix copying on Windows
>
> Currently copying is broken on Windows:
>
>  cp -af ../third_party/openthread/repo/etc/cmake/openthread-config-generic.h.in gen/include/openthread-config-generic.h
>   CreateProcess failed: The system cannot find the file specified.
>
> Fix it with a python one liner.
>
> Bug: 302
> Change-Id: Ie046acb71757c90232eb1067c4b779dfcd59857f
> Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/30201
> Reviewed-by: Wyatt Hepler <hepler@google.com>
> Commit-Queue: Michael Spang <spang@google.com>

TBR=hepler@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 302
Change-Id: I4fec018e415d25ed02ea3beab9fcd357f5489a2b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/30600
Commit-Queue: Michael Spang <spang@google.com>
Reviewed-by: Michael Spang <spang@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 73c9f40..e9aca66 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -139,7 +139,6 @@
     "$dir_pw_rpc/py",
     "$dir_pw_status/py",
     "$dir_pw_tokenizer/py",
-    "$dir_pw_toolchain/py",
     "$dir_pw_trace/py",
     "$dir_pw_trace_tokenized/py",
     "$dir_pw_unit_test/py",
diff --git a/pw_toolchain/py/BUILD.gn b/pw_toolchain/py/BUILD.gn
deleted file mode 100644
index f2db3c3..0000000
--- a/pw_toolchain/py/BUILD.gn
+++ /dev/null
@@ -1,26 +0,0 @@
-# Copyright 2021 The Pigweed Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may not
-# use this file except in compliance with the License. You may obtain a copy of
-# the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations under
-# the License.
-
-import("//build_overrides/pigweed.gni")
-
-import("$dir_pw_build/python.gni")
-
-pw_python_script("copy_file") {
-  sources = [ "copy_file.py" ]
-  pylintrc = "$dir_pigweed/.pylintrc"
-}
-
-pw_python_group("py") {
-  python_deps = [ ":copy_file" ]
-}
diff --git a/pw_toolchain/py/copy_file.py b/pw_toolchain/py/copy_file.py
deleted file mode 100644
index dda3fef..0000000
--- a/pw_toolchain/py/copy_file.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright 2021 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.
-"""Copies a file."""
-
-import sys
-import shutil
-
-if __name__ == "__main__":
-    shutil.copyfile(sys.argv[1], sys.argv[2])
diff --git a/pw_toolchain/universal_tools.gni b/pw_toolchain/universal_tools.gni
index 19717ba..8fcc062 100644
--- a/pw_toolchain/universal_tools.gni
+++ b/pw_toolchain/universal_tools.gni
@@ -12,17 +12,9 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
-import("//build_overrides/pigweed.gni")
-
 pw_universal_copy = {
   if (host_os == "win") {
-    command = string_join(" ",
-                          [
-                            python_path,
-                            rebase_path("$dir_pw_toolchain/copy_file.py"),
-                            "{{source}}",
-                            "{{output}}",
-                          ])
+    command = "cp -af {{source}} {{output}}"
   } else {
     # Use a hard link if possible as this is faster. Also, Mac doesn't
     # preserve timestamps properly with cp -af.