[roll third_party/pigweed] pw_env_setup: Clean up duplicated packages

Original-Bug: 392
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/47300

third_party/pigweed Rolled-Commits: b71fed24ee6be3e..8bbc213e8b763ab
Roller-URL: https://ci.chromium.org/b/8845408354079524368
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8845408354079524368
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iaeb08001285e9dd41317adef3f5018c9ba3f6e74
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/47820
Reviewed-by: 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 b71fed2..8bbc213 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit b71fed24ee6be3e0dfb1fe3de2b253891a9a60e8
+Subproject commit 8bbc213e8b763abd64de8093e42b6ed6c8e5fa9e