. a few changes in the CPU extensions detection code, borrowed from the

 . a few changes in the CPU extensions detection code, borrowed from the
   kernel and from mpeg2dec. I still don't know how to detect if code
   compiled with -mcpu=pentiumpro will run, since the cpuid arcanes are
   quite obtuse to me. Perhaps we should also have a way not to load modules
   if they have been compiled with a different CPU to avoid segfaults.