package: use variables defined by autoconf.mk
autoconf.mk defines AUTOCONF and AUTOHEADER variables, use them in packages
using autoconf.
This is a refactoring which shouldn't impact the final behavior.
Signed-off-by: Nicolas Carrier <nicolas.carrier@orolia.com>
Reviewed-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>