vhost: fix build with old kernels
vhost: fix build with old kernels

Commit 15e9ee6982a4822ce395fd597dd500a61ceafa7c
uses the VIRTIO_F_VERSION_1 macro existing only in newer kernels.

Fixed it by manually defining it for older kernels.

Fixes: 15e9ee6982a4 ("vhost: enable virtio 1.0")

Reported-by: Qian Xu <81156ea8c687d383f58bd067d87c20618b5afdb1@intel.com>
Signed-off-by: Marcel Apfelbaum <44592b4eea36663c86b994bb0ea99d15309c1c7d@redhat.com>

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