roll: third_party/pigweed 2 commits

9175df7b56d3ca3 pw_rpc: Avoid recompiling protos for every test
a75b71635be01bd pw_preprocessor: Test GCC/Clang diagnostic modific

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 80c7c7400725ca1..9175df7b56d3ca3
Roller-URL: https://ci.chromium.org/b/8738943738928558193
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I384dca1fee94c1662a506a930c82d3b04cedce50
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/231393
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 80c7c74..9175df7 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 80c7c7400725ca15434f8a64a323f7f1bcea64f6
+Subproject commit 9175df7b56d3ca387ee05100fc29cfd7c5cd46da