d/rules: Fix build due to build target being re-run

Signed-off-by: Niels Thykier <niels@thykier.net>
po4a/po4a-checks.cfg.in: Remove the -k 80 argument

It overrides the cmd-line argument.

Signed-off-by: Niels Thykier <niels@thykier.net>
po4a: Sort check names in LC_ALL to ensure it is stable

Signed-off-by: Niels Thykier <niels@thykier.net>