Create a lot of `FSEventStream`s to make `FSEventStreamStart()` fail. Fetch the error code and verify that it is correct.
Drops commit 3780e12 ("fsevents: support japaneese characters in path") for being quite inapplicable to the master branch. Will be reworked and applied in a follow-up commit. Conflicts: README.md build.mk src/unix/fsevents.c src/unix/udp.c
3780e12
29fdb3471