common/mlx5: add Verbs usage flag
common/mlx5: add Verbs usage flag

Add a Verbs file presence indication. Under Linux it is required that
file infiniband/verbs.h is installed for building DPDK.  Other
operating systems (e.g. Windows) ignore Verbs completely.  This commit
adds definition HAVE_INFINIBAND_VERBS_H (file mlx5_autoconf.h) to
indicate whether DPDK compiles with Verbs or not.

Signed-off-by: Ophir Munk <da2dc1f9ae64c8bd405ef0cf049405a44490d24e@nvidia.com>
Acked-by: Matan Azrad <6969f5f553ad7652679a585a85d7321babc90464@nvidia.com>

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