Added declerations for mdb_find_{last_le,first_gt}.
Added declerations for mdb_find_{last_le,first_gt}.

BarrelfishOS/barrelfish,linusyang/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,linusyang/barrelfish,linusyang/barrelfish,mslovy/barrelfish,kishoredbn/barrelfish,utsav2601/cmpe295A,8l/barrelfish,BarrelfishOS/barrelfish,mslovy/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,kishoredbn/barrelfish,utsav2601/cmpe295A,kishoredbn/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,mslovy/barrelfish,kishoredbn/barrelfish,utsav2601/cmpe295A,linusyang/barrelfish,utsav2601/cmpe295A,BarrelfishOS/barrelfish,8l/barrelfish,8l/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,mslovy/barrelfish,linusyang/barrelfish,8l/barrelfish,utsav2601/cmpe295A,BarrelfishOS/barrelfish