[Openais] [Corosync] Patch to improve BSD support

[Jérôme Flesch]

This patch adds a call to madvise(..., MADV_NOSYNC) after each call to 
mmap() . MADV_NOSYNC is an option specific to BSD systems specifying to 
the system to not write data on the disk unless it's really needed.

It doesn't seem really required to make Corosync works on FreeBSD 
(performances look the same with or without), but the man page of 
madvise() on FreeBSD says it should be done when using mmap() to create 
shared memory.

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