ORBit compile on HPUX (again!)

[Dan Newcombe <Newcombe mordor clayton edu>]

This is about the 5th time I've said this:

ORBit fails to build on HPUX (h_errno not defined in connection.c)
This fixes it in a rather benign manner:

*** src/IIOP/connection.c.orig  Thu Jan 28 16:02:23 1999
--- src/IIOP/connection.c       Thu Jan 28 16:04:02 1999
***************
*** 1,5 ****
--- 1,11 ----
  #include "config.h"
+ #ifndef _XOPEN_SOURCE_EXTENDED
+ #     define _XOPEN_SOURCE_EXTENDED
+ #endif
  #include "iiop-endianP.h"
+ #ifdef _XOPEN_SOURCE_EXTENDED
+ #     undef _XOPEN_SOURCE_EXTENDED
+ #endif
  #include "IIOP.h"
  #include "IIOP-private.h"
  #include "giop-msg-buffer.h"
***************
*** 10,17 ****
--- 16,29 ----
  #include <fcntl.h>
  #include <sys/socket.h>
  #include <sys/un.h>
+ #ifndef _XOPEN_SOURCE_EXTENDED
+ #     define _XOPEN_SOURCE_EXTENDED
+ #endif
  #include <arpa/inet.h>
  #include <netdb.h>
+ #ifdef _XOPEN_SOURCE_EXTENDED
+ #     undef _XOPEN_SOURCE_EXTENDED
+ #endif
  #include <ctype.h>
  #include <string.h>
  #include <sys/time.h>