roll: third_party/pigweed: pw_build: Fix Undefined identifier

The `output_name` was removed in http://pwrev.dev/230012. This caused
bootstrape to fail when `pw_rust_static_library` is used.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/232371
Docs-Not-Needed: Min Xu <minxm@google.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 703588e49635495..3919d9638b64545
Roller-URL: https://ci.chromium.org/b/8737068565451154369
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I19f65660d45d8080b9b2c0c457a4e62b4e4b9f51
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/235252
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 703588e..3919d96 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 703588e49635495138159e86bbed801d9e0e24bb
+Subproject commit 3919d9638b6454512595c8ad39fb8806d4ac9629