Add a way to disable memtracker
Sometimes memtracker gets in the way when debugging. This patch adds a flag --disable-memtracker to configure.
In the patch, memtracker NANOS_MEMTRACKER_ENABLED
is set for all versions (if not disabled). Only when both NANOS_DEBUG_ENABLED
and NANOS_MEMTRACKER_ENABLED
are set, memtracker code is used.
This way we can decouple memtracker and debug if it is needed.