[perl #128538] [PATCH] Fix copy/paste error in Configure

Self-explanatory.  The code in question adds -quadmath to archname, but only
if it isn't already there.  However, since this was copied from a few lines
earlier, it checks for -ld instead of -quadmath.

Author: H.Merijn Brand

Configure

@@ -7254,7 +7254,7 @@ case "$usequadmath" in
 $define)
 	echo "quadmath selected." >&4
 	case "$archname" in
-	*-ld*) echo "...and architecture name already has -quadmath." >&4
+	*-quadmath*) echo "...and architecture name already has -quadmath." >&4
 		;;
 	*)      archname="$archname-quadmath"
 		echo "...setting architecture name to $archname." >&4