snat: remove duplicate makefile var definition
snat: remove duplicate makefile var definition

Change-Id: Id910f033c693be882ef5da6adca4a9b46de057e4
Signed-off-by: Gabriel Ganne <54ed6f2b99047a4f6b8431ec375373608f566aee@qosmos.com>

chrisy/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,milanlenco/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,FDio/vpp,vpp-dev/vpp,FDio/vpp,milanlenco/vpp,milanlenco/vpp,chrisy/vpp,FDio/vpp,milanlenco/vpp,chrisy/vpp,milanlenco/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,chrisy/vpp,chrisy/vpp,GabrielGanne/vpp-flowtable,vpp-dev/vpp,milanlenco/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp