Enabling Spleen 64 from boot

From: Alexander Ziaee <ziaee_at_FreeBSD.org>
Date: Sat, 12 Apr 2025 23:35:02 UTC
Hello,

I'd like to enable spleen 64 in the build. It provides 80x25 character console on my 14" 2560x1600 display. I don't understand Makefile very well, but it is working on my machine. Attached is the review.

[0]: https://reviews.freebsd.org/D49768

Best,
Alex