kvm tools: Fix 64-bit assumptions and type uglinesses

kvm tools: Fix 64-bit assumptions and type uglinesses

Make the MIN_RAM_SIZE_MB constant 64-bit on 32-bit systems as well, otherwise
we get this build failure:

  kvm-run.c: In function ‘kvm_cmd_run’:
  kvm-run.c:119: error: format ‘%lu’ expects type ‘long unsigned int’, but argument 2 has type ‘u64’

Also adjust affected printf format string - this necessiates the use of
the sane Linux definition of u64 instead of the brain-dead int64_t
variant.

That also allows (and necessiates) the removal of the ugly PRIu64 format
string hackery. Friends don't let friends use PRI* hackeries! :-)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Pekka Enberg <penberg@kernel.org>