[roll third_party/pigweed] pw_toolchain: Add -fno-ms-compatibility to cflags on Windows

When building with clang on Windows targeting msvc, clang will enable
ms-compatibility mode that breaks pigweed's macro magics. This patch
disable it.

Original-Bug: b/297542996
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/187173

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 9125bcd82d833b9..a45e16f5e308f59
Roller-URL: https://ci.chromium.org/b/8759327215242149697
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I761ee80dbf7d993cd2c9bd2c281f9495b743b9ec
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/187196
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 9125bcd..a45e16f 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 9125bcd82d833b90d20f15ace445e6895c7aa050
+Subproject commit a45e16f5e308f59c8dffd984d74e4e974d7a1a91