[roll third_party/pigweed] pw_env_setup: Skip downloading overridden packages

Original-Bug: b/246971220
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/110476

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: df6f1d5e7e918c0..fa1dc6208a48e84
Roller-URL: https://ci.chromium.org/b/8801924497462149073
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6a5a4cc13da216a30ca02ff3bfa3261b335014ed
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/112134
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index df6f1d5..fa1dc62 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit df6f1d5e7e918c019c4ba56fee7c133f795ec4f2
+Subproject commit fa1dc6208a48e844ddf52c7e8252331ada9ced9a