Wheel should have headers, not include (#2523)

pep-0427.txt

@@ -193,7 +193,7 @@ its version, e.g. ``1.0.0``, consist of:
 #. ``{distribution}-{version}.data/`` contains one subdirectory
    for each non-empty install scheme key not already covered, where
    the subdirectory name is an index into a dictionary of install paths
-   (e.g. ``data``, ``scripts``, ``include``, ``purelib``, ``platlib``).
+   (e.g. ``data``, ``scripts``, ``headers``, ``purelib``, ``platlib``).
 #. Python scripts must appear in ``scripts`` and begin with exactly
    ``b'#!python'`` in order to enjoy script wrapper generation and
    ``#!python`` rewriting at install time.  They may have any or no