ev_stat inotify implementation might miss events

[Yoann Vandoorselaere]

Following this discussion, here is the patch I came to write. 
This apply against libev-3.9 vanilla.

Feel free to include it, or not, in the libev distribution. 

>From the local testing I've made (although some more is needed), this is
working fine and fixes various problem that I reported.

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