roll: third_party/pigweed pw_thread_freertos: Build unit tests

Original-Bug: b/271465588
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/215232
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: c5cf4e357be926b9c47a1f083fcfcd69d2eac524

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 8a67d6b57b5267..c5cf4e357be926
Roller-URL: https://ci.chromium.org/b/8736438354225592801
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I99a39636f3779da0e7a16dca371092e65a74d27d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/236755
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: 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 8a67d6b..c5cf4e3 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 8a67d6b57b526757ffa010be2be402c42cd13ac4
+Subproject commit c5cf4e357be926b9c47a1f083fcfcd69d2eac524