PR_SET_MM_MAP only went in to the kernel at 3.18 (or 3.19), so we need to
define these for kernels before then. If there was an error, the code
simply logs the failure and continues on.

Also, we can drop the PR_SET_MM_otherstuff contstants since those were
dropped in 93525c00.
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>