Add simple test for 'pathlib'.

Author: fangerer

graalpython/com.oracle.graal.python.test/src/tests/test_pathlib.py

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+
+def test_pathlib():
+    from pathlib import Path
+    p = Path("/usr")
+    assert str(p) == "/usr"
+    assert str(p.absolute()) == "/usr"
+    assert str(p / "local") == "/usr/local"
+