[roll third_party/pigweed] pw_env_setup: Remove transitional handler

Original-Bug: 103
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/46040

third_party/pigweed Rolled-Commits: 42f03409a9ca2d3..ce56313bf9f34b1
Roller-URL: https://ci.chromium.org/b/8846609660036563568
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8846609660036563568
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iaa48f3af234f7605657b655d00d02a589b0c4016
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/46522
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 42f0340..ce56313 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 42f03409a9ca2d343eef406bf42153d03a662ed2
+Subproject commit ce56313bf9f34b1038e9967133fe56fced36fe37