[Toybox] [PATCH] grep: add --exclude-dir.

[enh]

Used quite a lot, especially with `--exclude-dir=.git`.
---
 tests/grep.test   |  8 ++++++++
 toys/posix/grep.c | 16 ++++++++++------
 2 files changed, 18 insertions(+), 6 deletions(-)
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