Use the -o intr mount option on FreeBSD (#462)

FUSE file systems normally indicate their interruptibility by returning
ENOSYS to the first FUSE_INTERRUPT operation.  But that causes two
problems for file systems that aren't interruptible:

1) A process may block on a signal, even if another thread could've
handled the signal.  The kernel must know whether the FUSE thread is
interruptible before deciding which thread should receive a signal.

2) The protocol allows a FUSE daemon to simply ignore FUSE_INTERRUPT
operations.  From the kernel's point of view, that is indistinguishable
from a FUSE_INTERRUPT operation arriving after the original operation
had already completed.  Thus, the kernel can't interpret an ignored
FUSE_INTERRUPT as an indication that the daemon is non-interruptible.

With the -o nointr mount option, no FUSE_INTERRUPT operations will ever
be sent.  Most FUSE file systems should require no modifications to take
advantage of this mount option.

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