[roll pigweed] pw-build: Add iOS to the list of supported host operating systems

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/105481

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 0ef8d77ff8f2d79..999628a830e0ab4
Roller-URL: https://ci.chromium.org/b/8806360943787016545
Cq-Cl-Tag: roller-builder:pigweed-zephyr-roller
Cq-Cl-Tag: roller-bid:8806360943787016545
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic296a421b275b5ba75b39616e1eff720b1472860
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/105502
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/pigweed b/pigweed
index 0ef8d77..999628a 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit 0ef8d77ff8f2d79df5c3108c21f74e1a491ab1af
+Subproject commit 999628a830e0ab4f1ec86ef1effcdee34f11e5aa