build: create dummy Makefile
build: create dummy Makefile

This patch modifies the root Makefile to act as a dummy Makefile for
when the make support is removed from DPDK in subsequent patches.

Signed-off-by: Bruce Richardson <66b9e8e8fbd5e9f41f91b0af050876182ce9d0e4@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk