net: move slirp code from net.c to net/slirp.c

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/vl.c b/vl.c
index e6fcccf..ba5bd3d 100644
--- a/vl.c
+++ b/vl.c
@@ -138,6 +138,7 @@
 #include "hw/loader.h"
 #include "bt-host.h"
 #include "net.h"
+#include "net/slirp.h"
 #include "monitor.h"
 #include "console.h"
 #include "sysemu.h"