quick fix for TestDumpDwo

PR#66035 introduced a test failure that causes windows build bots to
fail. These unit tests shouldn't be running on Windows.

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Author: Tom Yang

lldb/test/API/commands/target/dump-separate-debug-info/dwo/TestDumpDwo.py

@@ -25,6 +25,7 @@ def get_dwos_from_json(self):
 
     @skipIfRemote
     @skipIfDarwin
+    @skipIfWindows
     def test_dwos_loaded_json_output(self):
         self.build()
         exe = self.getBuildArtifact("a.out")
@@ -47,6 +48,7 @@ def test_dwos_loaded_json_output(self):
 
     @skipIfRemote
     @skipIfDarwin
+    @skipIfWindows
     def test_dwos_not_loaded_json_output(self):
         self.build()
         exe = self.getBuildArtifact("a.out")
@@ -71,6 +73,7 @@ def test_dwos_not_loaded_json_output(self):
 
     @skipIfRemote
     @skipIfDarwin
+    @skipIfWindows
     def test_dwos_loaded_table_output(self):
         self.build()
         exe = self.getBuildArtifact("a.out")
@@ -97,6 +100,7 @@ def test_dwos_loaded_table_output(self):
 
     @skipIfRemote
     @skipIfDarwin
+    @skipIfWindows
     def test_dwos_not_loaded_table_output(self):
         self.build()
         exe = self.getBuildArtifact("a.out")