include: Define DRV_MCI_FIRST.

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,


MCI_USER_MESSAGES has referenced it for the last 10 years and nobody noticed it missing.

Now it matters because my mcimidi tests reveal distinct behavior
for DRV_MCI_FIRST < wMsg < DRV_MCI_LAST with w9x.

Regards,
 Jörg Höhle
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