[roll third_party/pigweed] roll: sysroot

From: git_revision:d342388843734b6c5c50fb7e18cd3a76476b93aa
To: git_revision:5afa3a948160c2f058c1c6f886bc9e034d467cf5
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/202170
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 2de4acb67e7e38d..4ab4b220f23f968
Roller-URL: https://ci.chromium.org/b/8750094181750634241
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iec9aeb4006d10cd3b720a97fa928a531c7a11c78
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/205210
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 2de4acb..4ab4b22 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 2de4acb67e7e38d68089831c28f8224040736b22
+Subproject commit 4ab4b220f23f96879a9c83b55f5570ab3af9a3af