[roll third_party/pigweed] pw_thread_stl: Disable tests failing on Windows

Some pw_thread tests have a tendency to hang indefinitely on Windows,
likely due to MinGW-w64's pthread port not being thread-safe on Windows.
This change disables those tests until we can try them again using the
native Windows threading implementation.

Original-Bug: b/317922402
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/186253

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3cb7f0eb3295718..ec98d2f6df3f871
Roller-URL: https://ci.chromium.org/b/8760476328233180481
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6713c4fc304aca63b422369352cc7b78376b85c4
Reviewed-on: https://pigweed-review.googlesource.com/c/gonk/+/186241
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 3cb7f0e..ec98d2f 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3cb7f0eb329571886e71179ad2b29a5066f4ae2c
+Subproject commit ec98d2f6df3f871e19afd3d40f3765c3e8e7a4ef