[roll pigweed] pw_build_info: Don't silence warning via builds

Since the warnings that pw_build_info needs to silence are handled
inside the source files, there's now no need for the warnings to be
silenced via compiler flags (which was brittle anyway).

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/103801

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: eb00223b63ac677..cce5b1d463de559
Roller-URL: https://ci.chromium.org/b/8807355708941473105
Cq-Cl-Tag: roller-builder:pigweed-zephyr-roller
Cq-Cl-Tag: roller-bid:8807355708941473105
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8d4b78196ff3c02731bdce3c9ff71f2fb4a6296f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/103831
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/pigweed b/pigweed
index eb00223..cce5b1d 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit eb00223b63ac677f5d2e54229da70d15389738e9
+Subproject commit cce5b1d463de559e3a70622d6119cfbc7ff5b633