net: move tap_probe_vnet_hdr() to tap-linux.c

Only Linux has support for IFF_VNET_HDR

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/net/tap-solaris.c b/net/tap-solaris.c
index de5855a..3f48e57 100644
--- a/net/tap-solaris.c
+++ b/net/tap-solaris.c
@@ -188,3 +188,8 @@
 {
     return 0;
 }
+
+int tap_probe_vnet_hdr(int fd)
+{
+    return 0;
+}