If many files change and the inotify queue overflows, rather than print
a traceback, invalidate the caches and warn the user.
[YOCTO #10676]
(Bitbake rev: 058f8517c041b80e8b591ad7d34a68281b2d03fc)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>