[Toybox] [PATCH] find: support -printf \0 octal escapes and \c.

[enh]

I think when I wrote this I tested the named escapes like \n and hex
escapes, and when I found \x wasn't supported I didn't even think of
octal. And I only learned about \c when I was looking at echo and printf
to compare their escape implementations a few weeks back.

Add the missing escapes and corresponding tests.

Fixes #139.
---
 tests/find.test   |  7 +++++++
 toys/posix/find.c | 10 +++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)
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