allow_experimental_apis flag has no effect for in-tree compilation.
See https://git.dpdk.org/dpdk/commit/?id=acec04c4b2f5
Fixes: 72f7566056 ("common/mlx5: move glue files under Linux directory")
Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Raslan Darawsheh <rasland@mellanox.com>