Define the value for in6addr_any on MingW, since it provides the struct

only in the header files and not in any libraries, yet declare it as
an extern.

Author: mhagander

src/backend/port/win32/mingwcompat.c

@@ -6,20 +6,27 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/port/win32/mingwcompat.c,v 1.8 2010/01/02 16:57:50 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/port/win32/mingwcompat.c,v 1.9 2010/02/09 19:55:14 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
 
 #include "postgres.h"
 
+#ifndef WIN32_ONLY_COMPILER
+/*
+ * MingW defines an extern to this struct, but the actual struct isn't present
+ * in any library. It's trivial enough that we can safely defined it
+ * ourselves.
+ */
+const struct in6_addr in6addr_any = {{{0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0}}};
+
+
 /*
  * This file contains loaders for functions that are missing in the MinGW
  * import libraries. It's only for actual Win32 API functions, so they are
  * all present in proper Win32 compilers.
  */
-#ifndef WIN32_ONLY_COMPILER
-
 static HMODULE kernel32 = NULL;
 
 /*