Disable part of this test on Windows

Author: DougGregor

test/Interop/C/struct/noncopyable_structs.swift

@@ -56,10 +56,12 @@ func bad1(_: borrowing BadDestroyNonCopyableType) { }
 // expected-warning@+1{{'BadDestroyNonCopyableType2' is deprecated: destroy function 'badDestroy2' must have a single parameter with type 'BadDestroyNonCopyableType2'}}
 func bad2(_: borrowing BadDestroyNonCopyableType2) { }
 
+#if !os(Windows)
 #if CPLUSPLUS
 // expected-cplusplus-warning@+1{{'ExtraDestroy' is deprecated: destroy operation 'extraDestroy' is not allowed on types with a non-trivial destructor}}
 func extra(_: borrowing ExtraDestroy) { }
 #endif
+#endif
 
 #endif