windows: Move out original handle in to_receiver() and to_sender()

Like in the other back-ends, remove (`mem::replae()`) the original
handle while constructing the wrappers, to make sure we do not keep
around a copy that might interfere if reused accidentally.

Author: antrik

src/platform/windows/mod.rs

@@ -1432,11 +1432,11 @@ impl OsOpaqueIpcChannel {
     }
 
     pub fn to_receiver(&mut self) -> OsIpcReceiver {
-        unsafe { OsIpcReceiver::from_handle(self.handle) }
+        unsafe { OsIpcReceiver::from_handle(mem::replace(&mut self.handle, INVALID_HANDLE_VALUE)) }
     }
 
     pub fn to_sender(&mut self) -> OsIpcSender {
-        unsafe { OsIpcSender::from_handle(self.handle) }
+        unsafe { OsIpcSender::from_handle(mem::replace(&mut self.handle, INVALID_HANDLE_VALUE)) }
     }
 }