[Toybox] [PATCH] echo: add -E.

[enh]

POSIX finally gave us a way to use echo in a portable way despite
differences of opinion about whether to default interpretation of escape
sequences to on or off: -e enables and -E disables (as already
implemented by busybox and coreutils).

http://austingroupbugs.net/view.php?id=1222
---
 tests/echo.test   | 3 +++
 toys/posix/echo.c | 5 +++--
 2 files changed, 6 insertions(+), 2 deletions(-)
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