inotify: Avoid most of the race conditions, get rid of Cint

There's still a condition that could be a race with fd-reuse, if one
goroutine is calling inotify.{AddWatch,RmWatch,Read}(); another
goroutine is calling inotify.Close(), and several things happen between
loadFd() running and the add_watch/rm_watch/read syscall launching:
 - syscall.Close() returns
 - syscall.Open() reuses the filedescriptor

           A                                  B
    syscall(loadFd())         inotify.Close(); syscall.Open()
    ----------------------------------------------------------
           loadFd()
                                     syscall.Close()
                                     syscall.Open()
           syscall()

Given that Read() can't be allowed to block Close() from running, I'm not
sure there's a way to fix this.

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