slirp: Add domain-search option to slirp's DHCP server

This patch will allow the user to include the domain-search option in
replies from the built-in DHCP server. The domain suffixes can be
specified by adding dnssearch= entries to the "-net user" parameter.

[Jan: tiny style adjustments]

Signed-off-by: Klaus Stengel <Klaus.Stengel@asamnet.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
diff --git a/slirp/libslirp.h b/slirp/libslirp.h
index 9b471b5..49609c2 100644
--- a/slirp/libslirp.h
+++ b/slirp/libslirp.h
@@ -12,7 +12,8 @@
                   struct in_addr vnetmask, struct in_addr vhost,
                   const char *vhostname, const char *tftp_path,
                   const char *bootfile, struct in_addr vdhcp_start,
-                  struct in_addr vnameserver, void *opaque);
+                  struct in_addr vnameserver, const char **vdnssearch,
+                  void *opaque);
 void slirp_cleanup(Slirp *slirp);
 
 void slirp_update_timeout(uint32_t *timeout);