DragonFly BSD 6.4.1

6.4.1 fixes a number of small, long-standing issues, including: Fixed the issue that a pkg(8) update might delete the df-latetest.conf config file, which rendered pkg(8) unusable. Updated the shipped ca_root_nss package so that the newer Let's Encrypt certificates are trusted and thus pkg(8) works with the Avalon HTTPS repo. Fixed a memory leak in the legacy IDE/NATA driver that could easily lead to kernel panics. Expose SMBIOS entry point via kenv so dmidecode(8) works on UEFI-only systems.