trivial diff: runtime/mercury_stack_trace.c: add `const'

[Fergus Henderson]

runtime/mercury_stack_trace.c:
	Add a missing `const'.

Index: runtime/mercury_stack_trace.c
===================================================================
RCS file: /home/mercury1/repository/mercury/runtime/mercury_stack_trace.c,v
retrieving revision 1.9
diff -u -r1.9 mercury_stack_trace.c
--- mercury_stack_trace.c	1998/06/18 06:08:05	1.9
+++ mercury_stack_trace.c	1998/07/02 07:59:44
@@ -59,7 +59,7 @@
 	Label			*label;
 	MR_Stack_Layout_Label	*layout;
 	MR_Stack_Layout_Entry	*entry_layout;
-	char			*result;
+	const char		*result;
 
 	fprintf(stderr, "Stack dump follows:\n");
 

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