acinclude: check for numa library

acinclude: check for numa library

Numa library is needed for NUMA aware vHost User functionality.
Incase of missing numa package, the OVS DPDK configuration fails with
"error: Could not find DPDK libraries in <DPDK_LOC>/TARGET/lib" though
the DPDK library is installed.

This patch fixes this inappropriate error by checking for presence of
numa library and output an appropriate error message "error: unable to
find libnuma, install the dependency package" in case of missing package.

Signed-off-by: Bhanuprakash Bodireddy <bhanuprakash.bodireddy@intel.com>
Acked-by: Ciara Loftus <ciara.loftus@intel.com>
Acked-by: Daniele Di Proietto <diproiettod@vmware.com>