build: fix external plugin build
build: fix external plugin build

Type: fix
Fixes: 88b2e3682be6303973fc59c3c62141d64a9e10d7

Change-Id: I4b29924246e2cdc307cf238c5cb8624f14317452
Signed-off-by: Benoît Ganne <38aad8ffcfa407b890d258e568f161530f66882d@cisco.com>

FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp