Fix configure script and "make check" for TCP Wrappers

Add missing #include's and static variables.

Problem spotted on OpenBSD.

configure.ng

@@ -470,6 +470,8 @@ AC_ARG_WITH(tcp-wrappers,
 			LIBS="-lwrap $LIBS"
 			LIBS_END="-lwrap $LIBS_END"
 			AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/socket.h>
 #include <tcpd.h>
 int allow_severity = 0;
 int deny_severity = 0;

src/portab/portabtest.c

@@ -24,6 +24,8 @@
 
 #include "exp.h"
 
+int allow_severity = 0, deny_severity = 0;
+
 static void
 Panic(char *Reason)
 {