Changes, which should enable to handle more VME Unican cards under RT-Linux.

Solution is not fully clean and it is not consistent with RT-Linux
way to handle regular ISA and PCI interrupts. The deeper analysis is
required, how to use this approach with regular Linux. May it be, that Linux 2.6.x
with latest IRQ threads and mutexes instead of spin-lock  patches from Ingo
Molnar could profit from this in future too.