Log Message:
Update to 4.3.0. From the changelog:

- add ability to mmap a device other than /dev/mem, enabling easier
  testing of memory for hardware engineers et al if their system's
  kernel exports the memory they're interested in via /dev/mydevice
  or similar. Thanks: Jean-Noel Avila.

- add ability to run only specified tests by setting the environment
  variable MEMTESTER_TEST_MASK to a bitmask of the indexes of the
  tests to be run. Thanks: Ian Alexander.

Updating this during the freeze as it's a leaf package and the
changes should be low-impact.