less: add ptest support

add ptest support for less

root@qemux86-64:~# ptest-runner less
START: ptest-runner
2023-08-21T14:22
BEGIN: /usr/lib/less/ptest
TEST chinese1.lt
PASS: chinese1 (30 steps)
TEST colorbars.lt
PASS: colorbars (222 steps)
TEST github216.lt
PASS: github216 (143 steps)
TEST github265.lt
PASS: github265 (17 steps)
TEST github329.lt
PASS: github329 (28 steps)
TEST hdr-unicode.lt
PASS: hdr-unicode (164 steps)
TEST hdr-unicode1.lt
PASS: hdr-unicode (107 steps)
TEST proc-special.lt
PASS: proc-special (107 steps)
TEST seq200.lt
PASS: seq200 (18 steps)
TEST subsearch.lt
PASS: subsearch (59 steps)
TEST table-50x200.lt
PASS: table-50x200 (467 steps)
TEST utf8-2.txt.lt
PASS: utf8-2.txt (309 steps)
TEST version.c.lt
PASS: version.c (38 steps)
RAN  13 tests with 0 errors
DURATION: 184
END: /usr/lib/less/ptest
2023-08-21T14:25
STOP: ptest-runner
TOTAL: 1 FAIL: 0

[YOCTO #15073]

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>