Skip test_target_create_invalid_core_file on Windows

[amccarth]

Summary

The operation is supposed to fail, but apparently it fails on Windows for a different reason than the test anticipated.

[amccarth]

Somebody else already did this while I was waiting for review.

lldb/packages/Python/lldbsuite/test/functionalities/target_command/TestTargetCommand.py

def test_target_create_unreadable_core_file(self):
         self.expect("target create -c '" + tf.name + "'", error=True,
                     substrs=["core file '", "' is not readable"])
 
     @no_debug_info_test
     def test_target_create_nonexistent_sym_file(self):
         self.expect("target create -s doesntexist doesntexisteither", error=True,
                     substrs=["invalid symbol file path 'doesntexist'"])
 
+    @skipIfWindows
     @no_debug_info_test
     def test_target_create_invalid_core_file(self):
         invalid_core_path = os.path.join(self.getSourceDir(), "invalid_core_file")
         self.expect("target create -c '" + invalid_core_path + "'", error=True,
                     substrs=["Unable to find process plug-in for core file '"])
 
 
     # Write only files don't seem to be supported on Windows.