Fix API test expectation

Author: WillAyd

python/pyarrow/tests/test_misc.py

@@ -27,7 +27,7 @@
 
 def test_get_include():
     include_dir = pa.get_include()
-    assert os.path.exists(os.path.join(include_dir, 'arrow', 'api.h'))
+    assert os.path.exists(os.path.join(include_dir, 'arrow', 'python', 'api.h'))
 
 
 @pytest.mark.skipif('sys.platform != "win32"')