[third_party/pigweed] Roll 3 commits

ac388e7bdae6d03 pw_ide: Raise specific error on bad settings file
6920d0bb3b6898a pw_protobuf_compiler: Tests fail to build under cm
3aa838ba32d99bb pw_allocator: Improve namespacing

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 89c90454a256760..ac388e7bdae6d03
Roller-URL: https://ci.chromium.org/b/8748927085669946641
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I72361329f10c1f28c154c265f2a7fc5ee21de8bb
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/208117
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 89c9045..ac388e7 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 89c90454a256760e39057a5044b3bba36bd2e60b
+Subproject commit ac388e7bdae6d03a816670bf845b44fefccf6bc2