$OpenBSD$

Fix warnings.

Index: tools/newgen/globals.h
--- tools/newgen/globals.h.orig
+++ tools/newgen/globals.h
@@ -128,7 +128,7 @@ extern int errcnt;
 extern FILE* outfp;
 extern FILE* outhfp;
 
-extern void fatal(const char* msg, ...);
+extern void fatal(const char* msg, ...) __dead;
 extern void warning(const char* msg, ...);
 extern void yyerror(const char* msg, ...);
 extern int yydebug;
