gprof: Append -l to tst-gmon-gprof-l.sh data files

Append -l to tst-gmon-gprof-l.sh data files to avoid conflicts with
tst-gmon-gprof.sh data files.

	* testsuite/tst-gmon-gprof-l.sh (actual): Append -l.
	(expected): Likewise.
	(expected_dot): Likewise.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>