fs/proc/base.c (affects lowmemorykiller): oom_adj -17 triggers oom_score_adj of -1000

Prior to this patch, oom_score_adj was automatically calculated based
on the oom_adj value.
When setting an oom_adj value of the minium value (-17), automatically
set oom_score_adj to its minimum value (-1000) as well.

Signed-off-by: Dan Trifan <jimsth@gmail.com>
mm/oom_kill.c (affects lowmemorykiller): prevent changing oom_adj if its value is -17

This should prevent that the Android OS automatically changes
its value when a process has been explicitly set to be unkillable.

To gain control over either oom_adj or oom_score_adj again, set
oom_score_adj to 1000 (OOM_SCORE_MAX).

Signed-off-by: Dan Trifan <jimsth@gmail.com>

Conflicts:
	fs/proc/base.c