added PyUnicode_FromOrdinal() to unicode.pxd

Cython/Includes/cpython/unicode.pxd

@@ -89,6 +89,13 @@ cdef extern from *:
     # when u is NULL.
     object PyUnicode_FromUnicode(Py_UNICODE *u, Py_ssize_t size)
 
+    # Create a Unicode Object from the given Unicode code point ordinal.
+    #
+    # The ordinal must be in range(0x10000) on narrow Python builds
+    # (UCS2), and range(0x110000) on wide builds (UCS4). A ValueError
+    # is raised in case it is not.
+    PyObject* PyUnicode_FromOrdinal(int ordinal)
+
     # Return a read-only pointer to the Unicode object's internal
     # Py_UNICODE buffer, NULL if unicode is not a Unicode object.
     Py_UNICODE* PyUnicode_AsUnicode(object o) except NULL