[Unionfs] patch: VFS mutex i_node locking since kernel 2.6.16

[Christian Andreetta]

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This could maybe address the issues related to kernel panic where the left-most brach is r/o.
Quoting from Gentoo bugzilla (https://bugs.gentoo.org/show_bug.cgi?id=127073):
"Before kernel 2.6.16 the i_node locking in VFS was semaphore based. Now mutex are used."

The patch can be seen at https://bugs.gentoo.org/attachment.cgi?id=82766 (I'm not posting here, since it is rather long).

Patch submitted by diegob80 at yahoo dot it (tested)

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