Trivial fix to math.m

[Thomas Charles CONWAY]

Hi

I've committed the following fix.
-- 
Thomas Conway <conway at cs.mu.oz.au>
Nail here [] for new monitor.  )O+


library/math.m:
	Fix a quoting error in pragma c_code.

cvs diff: Diffing .
Index: math.m
===================================================================
RCS file: /home/staff/zs/imp/mercury/library/math.m,v
retrieving revision 1.18
diff -u -r1.18 math.m
--- math.m	1998/09/21 03:59:49	1.18
+++ math.m	1998/09/21 07:04:49
@@ -216,7 +216,7 @@
 
 :- pragma c_code("
 
-	#include "mercury_trace.h"
+	#include ""mercury_trace.h""
 	#include <stdio.h>
 
 	/*