Corrected a subtle but very bad compiler-dependent error in the

extflat code;  failure to provide a forward external reference
to EFHNBest() resulted in a failure to correctly evaluate a
boolean expression.  That resulted in a failure to merge
hierarchical nodes during ext2spice, resulting in an incorrect
netlist with single nodes broken up into pieces.

extflat/EFint.h

@@ -286,6 +286,7 @@ extern Def *EFRootDef();
     /* HierName manipulation */
 extern HierName *efHNFromUse();
 extern char *efHNToStrFunc();
+extern bool EFHNBest();
 
     /* Functions for hashing of HierNames */
 extern int efHNCompare();

extflat/EFvisit.c

@@ -66,7 +66,7 @@ bool efDevKilled();
  * 	(*subProc)(use, hierName, is_top)
  *	    Use *use;
  *	    HierName *hierName;
- *	    Boolean is_top;
+ *	    bool is_top;
  *	{
  *	}
  *