* gendistlist.sh (EXTRA_DISTFILES): Add `genvideolist.sh'.
* genmk.rb (video): New variable.
(CLEANFILES, VIDEOFILES): Add #{video}.
(#{video}): New target rule.
* genvideolist.sh: New file.
* Makefile.in (pkglib_DATA): Add video.lst.
(video.lst): New target rule.
* util/grub-mkconfig.in: Initialize ${GRUB_VIDEO_BACKEND} using
`video.lst'.
* util/grub.d/30_os-prober.in: Replace `vbe' with
${GRUB_VIDEO_BACKEND}.
All executable files in this directory are processed in shell expansion order. 00_*: Reserved for 00_header. 10_*: Native boot entries. 20_*: Third party apps (e.g. memtest86+). The number namespace in-between is configurable by system installer and/or administrator. For example, you can add an entry to boot another OS as 01_otheros, 11_otheros, etc, depending on the position you want it to occupy in the menu; and then adjust the default setting via /etc/default/grub.