[m-rev.] trivial diff: fix completion test failure

[Simon Taylor]

Estimated hours taken: 0.1

tests/debugger/completion.exp3:
	Add expected output for machines without readline installed.

Index: completion.exp3
===================================================================
RCS file: completion.exp3
diff -N completion.exp3
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ completion.exp3	9 Mar 2002 09:57:16 -0000
@@ -0,0 +1,2 @@
+Mercury runtime: `--force-readline' is specified in MERCURY_OPTIONS
+but readline() is not available.
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