John Baldwin f25bdd3bb3 Work around at least one busted BIOS. If we get a source index in a _PRT
entry that is not zero, assume that it is really a hard-wired IRQ (commonly
used for APIC routing) and not a source index.  In practice, we've only
ever seen source indices of 0 for legitimate non-hard-wired _PRT entries.

Reviewed by:	njl
Tested by:	Alex Lyashkov shadow at psoft dot net
MFC after:	2 weeks
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