roll: third_party/pigweed pw_rpc_transport: Remove stray includes

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/248234
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Original-Revision: c521eeca9d38601a8d13ae542a1e59e363d7fbc8

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: a615b8bf5234f4..c521eeca9d3860
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8731497165995111921
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If2d5a04c629135ce21da5f0a385c73be6fb396fd
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/248097
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diff --git a/third_party/pigweed b/third_party/pigweed
index a615b8b..c521eec 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a615b8bf5234f48b8a33e6c837aa7521fa80d92a
+Subproject commit c521eeca9d38601a8d13ae542a1e59e363d7fbc8