debugserver will now report the minimum version load command

os name and version # from the mach-o binary as it scans the
header/load commands from memory and sends the details back
in the jGetLoadedDynamicLibrariesInfos response.  lldb isn't
using these fields yet but I have a suspicion I'm going to 
need them soon.

<rdar://problem/25251243> 

llvm-svn: 274725