[Toybox] [PATCH] Implement dmesg -T.

[enh]

Also refactor so that legacy mode gets all the new functionality too, and
add -S to make it easier to test legacy mode on 3.5 or newer kernels (at least
on the host; on Android the syslog(2) system call is no longer allowed).

Bug: http://b/36090178
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 toys/pending/dmesg.c | 153 +++++++++++++++++++++++++++++----------------------
 1 file changed, 88 insertions(+), 65 deletions(-)
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