[Toybox] [PATCH] grep: add -R as well as -r.

[enh]

On BSD these are actually the same, and there's a -S that you need in
addition. So strictly this is a behavior change for Android (which is
going from BSD grep to toybox grep), but it's a behavior preserving
change for the AOSP build (which is going from GNU grep to toybox grep),
and the latter actually has a checked-in use of -R where the former
doesn't.
---
 tests/grep.test   | 9 +++++++++
 toys/posix/grep.c | 7 +++++--
 2 files changed, 14 insertions(+), 2 deletions(-)
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