[roll third_party/pigweed] pw_env_setup: Add --strict option

Add a --strict option to env_setup.py. On workstations there are some
warnings during env setup that don't cause env setup to fail. This lets
LUCI runs make those warnings errors.

Original-Bug: 392
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/47320

third_party/pigweed Rolled-Commits: 13694358961c9a8..be27297eda420d0
Roller-URL: https://ci.chromium.org/b/8845517511884560416
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8845517511884560416
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ib26a45402a8a6fefbce4fa538dce3a1e174f6b5d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/47700
Reviewed-by: 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 1369435..be27297 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 13694358961c9a82b734e16f4c3cc9a6cd4da531
+Subproject commit be27297eda420d040080bd7f335db165223dbe68