build: Fixed some build warnings on FreeBSD.

src/pcap.c

@@ -27,6 +27,7 @@
 #ifdef _WIN32
 #include <ws2tcpip.h>
 #else
+#include <netinet/in.h>
 #include <sys/time.h>
 #include <sys/socket.h>
 #endif

src/server.c

@@ -28,6 +28,9 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#ifndef _WIN32
+#include <netinet/in.h>
+#endif
 
 #include "libssh/priv.h"
 #include "libssh/libssh.h"