Add missing includes to route.h test for FreeBSD. Fixes #2379

CHANGELOG

@@ -1,5 +1,8 @@
 #Nmap Changelog ($Id$); -*-text-*-
 
+o [GH#2379] Nmap and Nping were unable to obtain system routes on FreeBSD
+  [benpratt, nnposter]
+
 o [GH#2464] Script ipidseq was broken due to calling an unreachable library
   function. [nnposter]
 

libdnet-stripped/NMAP_MODIFICATIONS

@@ -2561,3 +2561,15 @@ index c69b29b..8a9d2bc 100644
  		if (r->ipftable != NULL)
  			free(r->ipftable);
  		if (r->ipftable2 != NULL)
+o Additional fix for route detection on FreeBSD 11, where net/route.h
+  requires sys/types.h
+--- a/libdnet-stripped/configure.in	2020-10-14 21:08:09.275534843 -0600
++++ b/libdnet-stripped/configure.in	2022-03-23 18:02:44.842111434 -0600
+@@ -177,6 +177,7 @@
+ 	AC_CHECK_HEADERS(hpsecurity.h stropts.h)
+ 	AC_CHECK_HEADERS(net/route.h, [], [],
+    [
++AC_INCLUDES_DEFAULT
+ #ifdef HAVE_SYS_SOCKET_H
+ #include <sys/socket.h>
+ #endif

libdnet-stripped/configure

@@ -11351,6 +11351,7 @@ done
 	for ac_header in net/route.h
 do :
   ac_fn_c_check_header_compile "$LINENO" "net/route.h" "ac_cv_header_net_route_h" "
+$ac_includes_default
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif

libdnet-stripped/configure.in

@@ -177,6 +177,7 @@ else
 	AC_CHECK_HEADERS(hpsecurity.h stropts.h)
 	AC_CHECK_HEADERS(net/route.h, [], [],
    [
+AC_INCLUDES_DEFAULT
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif