roll: third_party/pigweed 974dd9e..4eff319 (2 commits)

4eff319:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/239355 Revert "pw_build: Add pw_copy_and_patch_file"
279ab4a:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237809 pw_chrono: Properly stamp build time in Bazel

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 974dd9e7201646..4eff319c3ab77b
Roller-URL: https://ci.chromium.org/b/8735159813915250625
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I89735390244837ad57b495d55a65984247f266a4
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/239512
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 974dd9e..4eff319 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 974dd9e72016464ee28f2831086ea6f561257939
+Subproject commit 4eff319c3ab77b6996c3bd86d559100be2bc115c