build: fix unsupported CMake comparison operation
build: fix unsupported CMake comparison operation

VERSION_GREATER_EQUAL is not supported before CMake version 3.7.

Type: fix

Signed-off-by: Jianlin Lv <752eae91a476c3d35f9a7fd15fcd40979a048de4@arm.com>
Change-Id: Id690b7b7c26121f9d289ebd0aaea0860be63795f

FDio/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp