remove unused QemuOpts parameter from net init functions

v1->v2:
- unchanged

v2->v3:
- keep "qemu-option.h" included in "net/slirp.h"

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

net/vde.c

@@ -110,8 +110,8 @@ static int net_vde_init(VLANState *vlan, const char *model,
     return 0;
 }
 
-int net_init_vde(QemuOpts *old_opts, const NetClientOptions *opts,
-                 const char *name, VLANState *vlan)
+int net_init_vde(const NetClientOptions *opts, const char *name,
+                 VLANState *vlan)
 {
     const NetdevVdeOptions *vde;