mkdepend: cleanup indentation and function declarations

to make it easier to read

Change-Id: Iff0fe055c12358edc1be335ec83d0855cc32f03c
Reviewed-on: https://gerrit.libreoffice.org/9877
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>