Allow Win32 to compile under MinGW. Major changes are:

Win32 port is now called 'win32' rather than 'win'
        add -lwsock32 on Win32
        make gethostname() be only used when kerberos4 is enabled
        use /port/getopt.c
        new /port/opendir.c routines
        disable GUC unix_socket_group on Win32
        convert some keywords.c symbols to KEYWORD_P to prevent conflict
        create new FCNTL_NONBLOCK macro to turn off socket blocking
        create new /include/port.h file that has /port prototypes, move
          out of c.h
        new /include/port/win32_include dir to hold missing include files
        work around ERROR being defined in Win32 includes

src/backend/libpq/be-secure.c

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/libpq/be-secure.c,v 1.31 2003/04/25 04:37:23 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/libpq/be-secure.c,v 1.32 2003/05/15 16:35:28 momjian Exp $
  *
  *	  Since the server static private key ($DataDir/server.key)
  *	  will normally be stored unencrypted so that the database
@@ -85,16 +85,12 @@
 #include "libpq/libpq.h"
 #include "miscadmin.h"
 
-#ifdef WIN32
-#include "win32.h"
-#else
 #include <sys/socket.h>
 #include <unistd.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #ifdef HAVE_NETINET_TCP_H
 #include <netinet/tcp.h>
-#endif
 #include <arpa/inet.h>
 #endif
 

src/backend/libpq/pqcomm.c

@@ -30,7 +30,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- *	$Header: /cvsroot/pgsql/src/backend/libpq/pqcomm.c,v 1.152 2003/04/25 01:24:00 momjian Exp $
+ *	$Header: /cvsroot/pgsql/src/backend/libpq/pqcomm.c,v 1.153 2003/05/15 16:35:28 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -357,6 +357,9 @@ Setup_AF_UNIX(void)
 	Assert(Unix_socket_group);
 	if (Unix_socket_group[0] != '\0')
 	{
+#ifdef WIN32
+		elog(FATAL, "Config value 'unix_socket_group' not supported on this platform");
+#else
 		char	   *endptr;
 		unsigned long int val;
 		gid_t		gid;
@@ -385,6 +388,7 @@ Setup_AF_UNIX(void)
 				 sock_path, strerror(errno));
 			return STATUS_ERROR;
 		}
+#endif
 	}
 
 	if (chmod(sock_path, Unix_socket_permissions) == -1)