[PATCH] DragonFly BSD support

The attached patch adds support for DragonFly BSD. Similar patches have 
been used with success by several DragonFly BSD users (for example [1]), 
but for some reason no-one submitted these.

The attached patch is tested by me in production only with 2.5.2, but I 
can't see the reason why it shouldn't work with 2.6 as well. 

[1] - http://leaf.dragonflybsd.org/mailarchive/users/2008-03/msg00135.html

regards,

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Hasso Tepper