Changed the shape of the howto type yet again.

Now m88kbcs support can self host.

bfd/libcoff.h

@@ -42,7 +42,7 @@ typedef struct {
 
 typedef struct icofdata 
 {
-  struct aouthdr *hdr;		/* exec file header */
+  struct aouthdr hdr;		/* exec file header */
   coff_symbol_type  *symbols;	/* symtab for input bfd */
   unsigned int *conversion_table;
   file_ptr sym_filepos;