[roll third_party/pigweed] pw_protobuf_compiler: Allow external usage of macros

Wrap labels in label constructor so workspace is resolved correctly in
macros.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/155432

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 840aa6976c30762..f144ed6642a665d
Roller-URL: https://ci.chromium.org/b/8775584825385628801
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I146c15d4ea723bcf2f5e836576a1d7560f330f7d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/155751
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 840aa69..f144ed6 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 840aa6976c3076280747f029dd0d88b80476dbf1
+Subproject commit f144ed6642a665df7eeb4693da4aaa7cb0141058