Fixed a problem installing header files.

See https://bugs.launchpad.net/zodb/+bug/459889

setup.py

@@ -189,6 +189,7 @@ setup(name="ZODB3",
       package_dir = {'': 'src'},
       ext_modules = exts,
       headers = ['src/persistent/cPersistence.h',
+                 'src/persistent/py24compat.h',
                  'src/persistent/ring.h'],
       license = "ZPL 2.1",
       platforms = ["any"],

src/persistent/py24compat.h

 /* Backport type definitions from Python 2.5's object.h */
-#ifndef PERSISTENT_PY24COMPATH_H
+#ifndef PERSISTENT_PY24COMPAT_H
 #define PERSISTENT_PY24COMPAT_H
 #if PY_VERSION_HEX < 0x02050000
 typedef int Py_ssize_t;