Improve hwloc support for various processors

Using CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2392.04-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf27  Family = f  Model = 2  Stepping = 7
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>

It's also using an older version of hwloc (1.3.1) and I have not yet tested it with a newer one, but since 0 and -1 are legitimate returns values for hwloc_get_nbobjs_by_type(), I think they should be handled in any case.

From the hwloc_get_nbobjs_by_type() man page:

static inline int  hwloc_get_nbobjs_by_type (hwloc_topology_ttopology,
       hwloc_obj_type_ttype) [static]
       Returns the width of level type type. If no object for that type
       exists, 0 is returned. If there are several levels with objects of that
       type, -1 is returned.

I'm attaching a smarter patch that handles both 0 and -1 return values for both CORE and SOCKET.  It logs a warning if it has to fudge a 0 return code and bails out with a helpful error message for -1, which I have no idea how to handle.  At least people won't have to waste time tracking down the problem this way.

Happy Friday,

    Jason