Add x86_64-mingw64 target

include/coff/external.h

@@ -1,6 +1,6 @@
 /* external.h  -- External COFF structures
    
-   Copyright 2001 Free Software Foundation, Inc.
+   Copyright 2001, 2006 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -55,7 +55,21 @@ AOUTHDR;
 
 #define AOUTHDRSZ 28
 #define AOUTSZ 28
-#endif
+
+typedef struct external_aouthdr64
+{
+  char magic[2];	/* Type of file.			*/
+  char vstamp[2];	/* Version stamp.			*/
+  char tsize[4];	/* Text size in bytes, padded to FW bdry*/
+  char dsize[4];	/* Initialized data "  ".		*/
+  char bsize[4];	/* Uninitialized data "   ".		*/
+  char entry[4];	/* Entry pt.				*/
+  char text_start[4];	/* Base of text used for this file. 	*/
+}
+AOUTHDR64;
+#define AOUTHDRSZ64	24
+
+#endif /* not DO_NOT_DEFINE_AOUTHDR */
 
 #ifndef DO_NOT_DEFINE_SCNHDR
 /********************** SECTION HEADER **********************/