gdb/testsuite: Add missing expected results

gdb/testsuite: Add missing expected results

The tests in this script are driven from two lists of expected
results, one of the lists is missing some data so DejaGNU ends up
passing the empty string to gdb_test, which means the test always
passes.

This commit adds the missing expected results into the script.  The
tests still pass so there's no change in the results, but we are now
actually checking GDB's behaviour.

gdb/testsuite/ChangeLog:

	* gdb.fortran/array-slices.exp: Add missing message data.