[configure] Setting the cpytype in config.h

This is required later so that the CPU model can be stored.  See
`src/dynoplibs/sys.ops`.
[dynoplibs] Setting the CPU_TYPE in sys.ops
[configure] Determine the cpu type and fill the appropriate config item

This information is needed in order to fill the PARROT_CPU_TYPE #define and
is required so that the CPU model (aka type) is specified as per the docs in
`src/dynoplibs/sys.ops`.

This currently only works on Linux; it *has* been tested, however not on
other platforms as yet.
[t] Update sysinfo.t now that the CPU_TYPE is known
Merge pull request #962 from paultcochrane/ptc/add_cpu_type

Add cpu type (aka cpu model) system information to parrot