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/utils/mb/encnames.c

@@ -2,7 +2,7 @@
  * Encoding names and routines for work with it. All
  * in this file is shared bedween FE and BE.
  *
- * $Id: encnames.c,v 1.12 2003/03/10 22:28:18 tgl Exp $
+ * $Id: encnames.c,v 1.13 2003/05/15 16:35:29 momjian Exp $
  */
 #ifdef FRONTEND
 #include "postgres_fe.h"
@@ -13,11 +13,7 @@
 #include "utils/builtins.h"
 #endif
 
-#ifdef WIN32
-#include "win32.h"
-#else
 #include <unistd.h>
-#endif
 
 #include "mb/pg_wchar.h"
 #include <ctype.h>