NFC: Mark the inconsistent-weaklinked-import.swift test case as unsupported on Windows because it uses @_weakLinked.

Author: tshortli

test/decl/import/inconsistent-weaklinked-import.swift

@@ -8,6 +8,8 @@
 // RUN: %target-swift-frontend -typecheck -primary-file %t/1.swift -primary-file %t/2.swift -primary-file %t/3.swift -I %S/Inputs/inconsistent-implementation-only/ -verify
 // RUN: %target-swift-frontend -typecheck %t/1.swift %t/2.swift %t/3.swift -I %S/Inputs/inconsistent-implementation-only/ -verify
 
+// UNSUPPORTED: OS=windows-msvc
+
 //--- 1.swift
 
 @_weakLinked import NotSoSecret // expected-note {{imported with @_weakLinked here}}