Bug 9656: Followup Make logging to a file optional (for fines)

Bug 9656: Followup Make logging to a file optional (for fines)

The -log option become optional if the -output_dir is given.

Test plan:
call the script with
1/ no one parameter : no log file
2/ -l : log file will be created in /tmp
3/ -o=/home/koha/var/log : log file with be created in the specified
4/ -o=/home/koha/var/log -l: Same as 3/

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Comment: All combination of options tested. Works well. No errors.
Signed-off-by: Elliott Davis <elliott@bywatersolions.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>