[Toybox] [PATCH] cal: highlight current day.

[enh]

This isn't in POSIX, but Debian and macOS' cal(1)s both do this, and
it's annoying to have to run date(1) separately.
---
 toys/posix/cal.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)
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