[third_party/pigweed] Roll 5 commits

ba479cf9a61c9a9 SEED-0001: Fix typo and formatting
f0732862b312cef pw_rpc: Run tests with completion callback config
51936c939a01ab9 docs: Add example of conditionally enabling code b
d3c6af1625f3e77 SEED-0114: Fix Compiler Explorer link
d9721a5c7adc7ed pw_toolchain: Remove duplicate config from Cortex-

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 1acfec029f8d3d8..ba479cf9a61c9a9
Roller-URL: https://ci.chromium.org/b/8759209543495151009
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iacce1475fd5df7a8fc9a71a0f8726c89fac95240
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/kudzu/+/187353
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 1acfec0..ba479cf 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 1acfec029f8d3d8b2a0135d75d298b848c06024d
+Subproject commit ba479cf9a61c9a971c16ea6af99676bb20ff8b99