R13A patches for os_mon on dragonfly

[G.Isenmann]

Hi, would it be possible to include these small patches into R13B? I
believe they have no side effect on other platforms and improve the
situation on dragonfly.

CC dragonfly-users:
 - The first patch is a copy of pkgsrc/wip/erlang/patches/patch-aa.
 - The others are probably also neccessary for both pkgsrc/lang/erlang
   (R12B) and pkgsrc/wip/erlang (R12B-5).
 - Noticed this while playing with rabbitmq.
 - Have ignored other patches from wip/erlang that probably need
   modifications for dragonfly but which do not look so simple (e.g.
   for erts/emulator/sys/unix/sys_float.c).

-- 
Goetz
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