[roll third_party/pigweed] pw_env_setup: Pull down clang on ARM Macs

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/149032

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 8dba6eb8388caf9..ac30a4484348500
Roller-URL: https://ci.chromium.org/b/8780028386263049425
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4acb96ddd0bb1356e62ef41c80bb763f825de191
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/149071
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 8dba6eb..ac30a44 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 8dba6eb8388caf9cf76007e6a432c408a76d4dc2
+Subproject commit ac30a44843485003ff4f1ac83e74fbd3b1268231