Merge pull request #21375 from compnerd/you-can-depend-on-me

SwiftPrivate: fix dependencies on Windows
diff --git a/stdlib/private/SwiftPrivate/CMakeLists.txt b/stdlib/private/SwiftPrivate/CMakeLists.txt
index 566f0db..30dc0f2 100644
--- a/stdlib/private/SwiftPrivate/CMakeLists.txt
+++ b/stdlib/private/SwiftPrivate/CMakeLists.txt
@@ -11,6 +11,7 @@
   IO.swift
   ShardedAtomicCounter.swift
 
+  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT
   SWIFT_COMPILE_FLAGS ${swift_swiftprivate_compile_flags}
   INSTALL_IN_COMPONENT stdlib-experimental)