BUG/MEDIUM: compat: fix segfault on FreeBSD

Since commit 65d805fd witch removes standard.h from compat.h some
values were not properly set on FreeBSD. This caused a segfault
at startup when smp_resolve_args is called.

As FreeBSD have IP_BINDANY, CONFIG_HAP_TRANSPARENT is define. This
cause struct conn_src to be extended with some fields. The size of
this structure was incorrect. Including netinet/in.h fix this issue.

While diving in code preprocessing, I found that limits.h was require
to properly set MAX_HOSTNAME_LEN, ULONG_MAX, USHRT_MAX and others
system limits on FreeBSD.

include/common/compat.h

@@ -22,11 +22,13 @@
 #ifndef _COMMON_COMPAT_H
 #define _COMMON_COMPAT_H
 
+#include <limits.h>
 /* This is needed on Linux for Netfilter includes */
 #include <sys/param.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
+#include <netinet/in.h>
 
 #ifndef BITS_PER_INT
 #define BITS_PER_INT    (8*sizeof(int))