Fix debug printfs in FPU_EMU to compile on powerpc64 and enable it for
powerpc64.  This fixes the LINT64 kernel config.

Approved by:	nwhitehorn (the idea, not the actual patch)
Fix the processor table entry structure to use a fixed-width type for
32-bit fields so it is the correct size on amd64.  Remove a workaround
for the broken structure from bhyve(8).

MFC after:	1 week
There is no sysctl with the MIB { CTL_KERN, KERN_MAXID }.

MFC after:	2 weeks
Fix a typo.