a/efibootmgr-16-x86_64-2.txz: Rebuilt.
a/efivar-35-x86_64-1.txz: Upgraded.
Switch to efivar-35, since 36 seems to have problems. Thanks to _RDS_.
ap/slackpkg-2.83.0-noarch-3.txz: Rebuilt.
Don't remove ChangeLog.txt upon upgrade/reinstall.
Use CHECKSUMS.md5.asc to determine if ChangeLog.txt is unchanged.
Remove dead bjtu.edu.cn mirrors from the sample mirrors files.
isolinux/initrd.img: Rebuilt.
Include libefivar.so.1 on the installer (needed by efibootmgr).
usb-and-pxe-installers/usbboot.img: Rebuilt.
Include libefivar.so.1 on the installer (needed by efibootmgr).
