roll: third_party/pigweed 4207345..c0b3d6a (4 commits)

c0b3d6a:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/276072 pw_libc: Provide errno and stdio libc backends
d01ddf0:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/277853 pw_bluetooth_proxy: Test channel not having recombine space
bab3948:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/277553 pw_bluetooth_proxy: Handle recombine of new channel with old id
f9f93dd:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/275913 docs: Clarify extern "C" and (void) parameter lists

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 4207345db6bcbe..c0b3d6af392b4f
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8719766582216325153
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic70d1a929910dd0ef4d17294f94ccb0da996e0a5
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/277925
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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 4207345..c0b3d6a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 4207345db6bcbe892ed756ba759c2a780705cf7e
+Subproject commit c0b3d6af392b4f5609c2fdc46227eb243286c4c4