roll: third_party/pigweed pw_build: Ensure PythonPackages dir tree exists

When building the PythonPackages directory tree, the parent tree
may not always exist, for example if it wasn't created by stamp files.

Original-Bug: b/367361134
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/236895
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: c1c7dac7e1e66d54928058eaa63e5f6c65f66a07

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 7f4759a3877ac3..c1c7dac7e1e66d
Roller-URL: https://ci.chromium.org/b/8736405482770516737
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I16f5b8fbd0ef8a5b9533ce1bc3120b9f22a8cb39
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/236761
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 7f4759a..c1c7dac 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 7f4759a3877ac31bb0b0b2799a759d13382d9bba
+Subproject commit c1c7dac7e1e66d54928058eaa63e5f6c65f66a07