[Toybox] [PATCH] tail: support -f on BSD too.

[enh]

Factor out the inotify code and add a kqueue equivalent.

Specifically tested on macOS 10.14, but I assume this works for other
BSDs too, given that I worked from the FreeBSD man page...
---
 lib/notify.c      | 87 +++++++++++++++++++++++++++++++++++++++++++++++
 lib/portability.h |  5 +++
 toys/posix/tail.c | 31 +++++------------
 3 files changed, 101 insertions(+), 22 deletions(-)
 create mode 100644 lib/notify.c
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