[roll third_party/pigweed] pw_watch: Build directory exclude list handling

Only add build directores to the exclude list if they are not a
subdirectory of an already excluded dir.

Original-Bug: b/317241320
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/185772

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: ab20a82a5f88c51..2ace3eed115d834
Roller-URL: https://ci.chromium.org/b/8761155347455366705
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0fd5b87f8a9ce2a623d7f3a088ce654f7ff873f8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/185774
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index ab20a82..2ace3ee 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ab20a82a5f88c5104a2a8dcf0731f12b4243ca19
+Subproject commit 2ace3eed115d834191f94f82453878c324de9f33