[roll third_party/pigweed] pw_log: Get bazel tests to build and pass

Original-Bug: 180
Original-Bug: b/210876793
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/80860

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 5fcc5356fea5d17..2d7958dc6e68cab
Roller-URL: https://ci.chromium.org/b/8824392227356521185
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8824392227356521185
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1935e375e037878638cbe848346be55bd2841bd4
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/80828
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 5fcc535..2d7958d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 5fcc5356fea5d17b3b2fa426cb12044a97b917cb
+Subproject commit 2d7958dc6e68cab5f1837e3ccde1627eda9aeb8f