Log Message:
Update to 4.1.2. From the changelog:

- fix portability issue with MAP_LOCKED flag. Thanks: Scott Haneda.
- remove debugging output accidentally left in v.4.1.0.
- cleanups
- memtester.h was missing from the 4.1.0 tarball; release update to
    fix that. Thanks: Owen Leonard.
- added the ability to test a specific physical region of memory
    (by mmap'ing /dev/mem) with the new -p option, which takes a
    hex starting address as a value. This is mostly of use to
    developers trying to verify memory or I/O mapped devices (on
    an embedded system, for instance). Thanks: Allon Stern.
- re-add the ability to set a suffix on the memory to allocate:
    "3G", "128K", etc, mostly for use with the above new feature,
    where the "memory" to be tested is less than a megabyte, but
    also useful for users wanting to test many gigabytes; you no
    longer have to do the conversion-to-megs in your head.
- documentation updates and clarifications.