Skip some failing tests on Windows

It's not obvious how to fix these, and it's not in code that ought to be
platform dependent, so let's skip these tests so we can see real
failures.

IPython/core/tests/test_shellapp.py

@@ -44,6 +44,9 b' class TestFileToRun(unittest.TestCase, tt.TempFileMixin):'
         err = SQLITE_NOT_AVAILABLE_ERROR if sqlite_err_maybe else None
         tt.ipexec_validate(self.fname, self.fname, err)
 
+    # The commands option to ipexec_validate doesn't work on Windows, and it
+    # doesn't seem worth fixing
+    @dec.skip_win32
     def test_py_script_file_attribute_interactively(self):
         """Test that `__file__` is not set after `ipython -i file.py`"""
         src = "True\n"
@@ -53,6 +56,7 b' class TestFileToRun(unittest.TestCase, tt.TempFileMixin):'
         tt.ipexec_validate(self.fname, 'False', err, options=['-i'],
                            commands=['"__file__" in globals()', 'exit()'])
 
+    @dec.skip_win32
     @dec.skipif(PY3)
     def test_py_script_file_compiler_directive(self):
         """Test `__future__` compiler directives with `ipython -i file.py`"""