bitbake: pyinotify: Handle potential latent bug

The kernel inotify code can set more than one of the bits in the mask,
fsnotify_change() in linux/fsnotify.h is quite clear that IN_ATTRIB,
IN_MODIFY and IN_ACCESS can arrive together. We don't care about two
of these from a bitbake perspective but it probably explains why in
real world builds, we've seen:

pyinotify.ProcessEventError: Unknown mask 0x00000006

This module code assumes only one mask bit can be present. Since we
don't care about two of these events, just mask them out for now.
The "upstream" code is unmainained since 2015.

(Bitbake rev: 7fb93c2ce6dacd9b53fc3a227133a3493e6a6a1d)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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