[Toybox] [PATCH] dd: implement oflag=append and oflag=direct.

[enh]

---
 lib/portability.h     |  7 ++++++-
 tests/dd.test         |  3 +++
 toys/pending/strace.c |  2 +-
 toys/posix/dd.c       | 16 +++++++++++-----
 4 files changed, 21 insertions(+), 7 deletions(-)
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