[Toybox] Subject: [PATCH] Add getopt(1).

[enh]

Includes new tests.
---
 lib/portability.h     |   3 ++
 tests/getopt.test     |  44 ++++++++++++++++++
 toys/pending/getopt.c | 104 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 151 insertions(+)
 create mode 100755 tests/getopt.test
 create mode 100644 toys/pending/getopt.c
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