Libreboot 20230625 released!

libreboot.org/news/libreboot20

Brief summary of changes since 20230423 release:

* Massive build system audit, bugs fixed. Cleaner BSD-like coding style now used for much of the logic.
* Two new boards (HP 2570p and 8300 USDT)
* Microcode-free ROMs available, as alternative to default ROMs that include it.
* gru-* chromebook fixes: more reliable boot/shutdown
* Better error handling in lbmk
* Forked spkmodem-recv from GNU, *pledged* it and re-wrote in OpenBSD coding style