add missing headers required for OpenBSD

kernel.c

@@ -21,6 +21,7 @@ THE SOFTWARE.
 */
 
 #include <sys/time.h>
+#include <sys/param.h>
 #include <time.h>
 
 #include "babeld.h"

kernel_socket.c

@@ -32,6 +32,7 @@ THE SOFTWARE.
 
 #include <strings.h>
 #include <netinet/in.h>
+#include <netinet/icmp6.h>
 #include <arpa/inet.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
@@ -40,6 +41,7 @@ THE SOFTWARE.
 #include <ifaddrs.h>
 #include <net/if.h>
 #include <net/if_dl.h>
+#include <net/if_media.h>
 #include <net/route.h>
 
 #include "babeld.h"

net.c

@@ -25,6 +25,7 @@ THE SOFTWARE.
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
+#include <sys/uio.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <netinet/in.h>

util.c

@@ -30,6 +30,7 @@ THE SOFTWARE.
 
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <netinet/in.h>
 #include <arpa/inet.h>
 
 #include "babeld.h"