Globally remove aclocal directories from target

* Remove $(TARGET_DIR)/usr/share/aclocal from target-finalize when not
  installing devfiles and
* Remove some (now) redundant cleanup from individual packages

Signed-off-by: Malte Starostik <m-starostik@versanet.de>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>