[roll third_party/pigweed] pw_env_setup: Disable venv check on Windows

Original-Bug: 400
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/50560

third_party/pigweed Rolled-Commits: 70245c78a7f4a03..e1a9f4d64ff2b6a
Roller-URL: https://ci.chromium.org/b/8843159862600788305
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8843159862600788305
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9181663a6c9bdbccd92c2d37ac15259f624ab7de
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/51380
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 70245c7..e1a9f4d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 70245c78a7f4a036b439b0dc1e784c58d468233e
+Subproject commit e1a9f4d64ff2b6ac27b2f8f4ed9a84a9897224d4