vendor: update fs notification package to build on Go 1.10

[karalabe]

Upstream code still broken with Go 1.10beta1: rjeczalik/notify#139, don't merge!

Go 1.10 changes a few types around CGO and pointers. This caused the filesystem notification package to fail building on macos:

# github.com/ethereum/go-ethereum/vendor/github.com/rjeczalik/notify
vendor/github.com/rjeczalik/notify/watcher_fsevents_cgo.go:51: cannot use nil as type _Ctype_CFAllocatorRef in argument to func literal
vendor/github.com/rjeczalik/notify/watcher_fsevents_cgo.go:162: cannot use nil as type _Ctype_CFAllocatorRef in argument to _Cfunc_CFStringCreateWithCStringNoCopy
vendor/github.com/rjeczalik/notify/watcher_fsevents_cgo.go:163: cannot use nil as type _Ctype_CFAllocatorRef in argument to func literal

The issue was known and already fixed upstream in rjeczalik/notify#136, this PR pulls in the latest code.

[karalabe]

@fjl You did see the first line of the PR description, right?

…

On Jan 2, 2018 12:41, "Felix Lange" ***@***.***> wrote: Merged #15785 <#15785>. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#15785 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAH6GebqAtLaS5Ds7oMqYVUDiDnonWyrks5tGgfvgaJpZM4RPuUH> .

[fjl]

I didn't see the first line, sorry. You even made it bold.

[karalabe]

Np, please be more careful next time.

…

On Jan 2, 2018 14:25, "Felix Lange" ***@***.***> wrote: I did not. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#15785 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAH6GTrAUdban3L_NpwPyK2MQEw6QYp-ks5tGiA3gaJpZM4RPuUH> .