Description:
------------
All four available COM error constants actually have the value -1,
what makes them indistinguishable, but more importantly makes them
useless for checking com_exception codes; the latter can be seen
when running 27974.phpt, which fails due to this mismatch.


Test script:
---------------
<?php
var_dump(
    DISP_E_DIVBYZERO,
    DISP_E_OVERFLOW,
    DISP_E_BADINDEX,
    MK_E_UNAVAILABLE
);
?>


Expected result:
----------------
int(-2147352558)
int(-2147352566)
int(-2147352565)
int(-2147221021)


Actual result:
--------------
int(-1)
int(-1)
int(-1)
int(-1)