[PATCH v2] net/virtio-user: fix build error in SUSE 11

[Jianfeng Tan <jianfeng.tan@intel.com>]

On some older systems, such as SUSE 11, the compiling error shows
as:
   .../dpdk/drivers/net/virtio/virtio_user/virtio_user_dev.c:67:22:
         error: ‘O_CLOEXEC’ undeclared (first use in this function)

The fix is to use EFD_CLOEXEC, which is defined in sys/eventfd.h,
instead of O_CLOEXEC which needs _GNU_SOURCE defined on some old
systems.

Fixes: 37a7eb2ae816 ("net/virtio-user: add device emulation layer")

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
v2:
 - Change the way to fix this issue.
 drivers/net/virtio/virtio_user/virtio_user_dev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index 3d12a32..1b1e5bf 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -63,12 +63,12 @@ virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
 	/* May use invalid flag, but some backend leverages kickfd and callfd as
 	 * criteria to judge if dev is alive. so finally we use real event_fd.
 	 */
-	callfd = eventfd(0, O_CLOEXEC | O_NONBLOCK);
+	callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 	if (callfd < 0) {
 		PMD_DRV_LOG(ERR, "callfd error, %s\n", strerror(errno));
 		return -1;
 	}
-	kickfd = eventfd(0, O_CLOEXEC | O_NONBLOCK);
+	kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 	if (kickfd < 0) {
 		close(callfd);
 		PMD_DRV_LOG(ERR, "kickfd error, %s\n", strerror(errno));
-- 
2.1.4