Fix warning in OSSignpost.swift w/ @preconcurrency import (#7785)

MaxDesiatov · web-flow · commit 6a4029e13237 · 2024-07-17T10:45:24.000-07:00
rdar://131432130
diff --git a/Sources/Basics/OSSignpost.swift b/Sources/Basics/OSSignpost.swift
@@ -11,7 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 #if canImport(os)
-import os
+@preconcurrency import os
 #endif
 
 #if canImport(os)
