[lldb] [test] Mark TestSendSignal XFAIL on NetBSD

lldb/packages/Python/lldbsuite/test/functionalities/signal/TestSendSignal.py

@@ -22,6 +22,7 @@ class SendSignalTestCase(TestBase):
     @expectedFailureAll(
         oslist=['freebsd'],
         bugnumber="llvm.org/pr23318: does not report running state")
+    @expectedFailureNetBSD(bugnumer='llvm.org/pr43959')
     @skipIfWindows  # Windows does not support signals
     def test_with_run_command(self):
         """Test that lldb command 'process signal SIGUSR1' sends a signal to the inferior process."""