automake: Compile DPDK as single library

Change-Id: I7e589f6b6dc33db7f00f77af536ab53debc6625c
Signed-off-by: Mark D. Gray <mark.d.gray@intel.com>
Reviewed-by: Mark B. Kavanagh <mark.b.kavanagh@intel.com>
Reviewed-by: Stephen Finucane <stephen.finucane@intel.com>