test: drop checksef.sh from EXTRA_DIST, generated now
test: drop checksef.sh from EXTRA_DIST, generated now

Also, silence generation of checkself.sh

Signed-off-by: Joachim Wiberg <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,troglobit/finit