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### Purpose On iOS, the FSEvents API for watching files (also used on macOS) is not available, but `kqueue` is. This PR ensures `kqueue` support is built on iOS instead of the FSEvents based watcher implementation. Before this PR, you could already use the `kqueue` build option to force its usage. Unfortunately `gomobile`, the tool that I use to build Syncthing for iOS and macOS for Synctrain, does not support setting different build flags for iOS and macOS (unless I build separately for each, which is a bit of a hassle because XCode nonsense). I am assuming there are good reasons to support FSEvents even though `kqueue` is also available on macOS (but I'm not sure why?). I do know FSEvents has been working fine for me on macOS so it seems best to use FSEvents on macOS and kqueue on iOS. Note that this also requires https://github.com/syncthing/notify/pull/4 to be merged in `synchting/notify` (until that is done, this PR will fail to build on iOS due to `notify` still trying to link to `fsevents` stuff when the `kqueue` build flag is not set). ### Testing I compiled both `syncthing/notify` and syncthing with this PR applied, and used that to successfully build the Synctrain iOS app, which after this PR works fine and should follow up file changes a bit quicker. ### Screenshots n/a ### Documentation n/a ## Authorship Your name and email will be added automatically to the AUTHORS file based on the commit metadata. --------- Co-authored-by: Jakob Borg <jakob@kastelo.net>