[Toybox] [PATCH] Add "uudecode -o -" support.

[enh]

busybox uudecode supports this, and POSIX explicitly mentions it (albeit
only in the "STDOUT" section). Plus Android doesn't have /dev/stdout and
/dev/stdin, so this lets us rewrite the uudecode tests so they pass on
Android too.
---
 tests/uudecode.test   | 19 +++++++++----------
 toys/posix/uudecode.c |  3 ++-
 2 files changed, 11 insertions(+), 11 deletions(-)
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