- Update VirtualBox ports to 5.2.44
- Adapt and regenerate patches
- Reduce differences in patch-src_VBox_Devices_PC_vbox-cpuhotplug.dsl 
Patch based on one provided by Mario Lobo <firstname.lastname@example.org>.
Many thanks to people who provided ideas and suggetions in the
PR and review.
Submitted by: Nikita Stepanov <email@example.com>
Reviewed by: kevans 
Tested by: lwshu
Approved by: ports-secteam (joneum)
Differential Revision: https://reviews.freebsd.org/D25496