rename of M_ alloc defines

[Eirik Nygaard <eirikn@xxxxxxxxxxxx>]

Jeffrey Hsu wondered if I could rename the mbuf alloc flags M_TRYWAIT,
M_DONTWAIT and M_WAIT to be MB_ instead. So they would not be confused
with the malloc flags in the kernel.

I will commit the patch on monday if there are nothing I missed.

http://eirikn.kerneled.org/dragonfly/M_toMB_inallocoperations.patch

--
Eirik Nygaard
eirikn@xxxxxxxxxxxx    Never let a computer know you're in a hurry.