* util/grub-mkconfig.in: Capitalise and export GRUB_PREFIX. Stop
setting GRUB_VIDEO_BACKEND. Make it available as a user override
instead. Replace the gfxterm backend check with a check that
${GRUB_PREFIX}/video.lst is non-empty.
* util/grub.d/00_header.in: Use GRUB_PREFIX rather than computing it
again.
(load_video): New generated function. Call it before loading
gfxterm rather than loading ${GRUB_VIDEO_BACKEND}.
* util/grub.d/10_linux.in (linux_entry): Call load_video.
* util/grub.d/30_os-prober.in (osx_entry): Likewise.
* docs/grub.texi (Simple configuration): Document
GRUB_VIDEO_BACKEND.
Use video functions in linux and xnu loaders.
* conf/i386-pc.rmk (xnu_mod_SOURCES): Remove loader/i386/pc/xnu.c.
* conf/x86-efi.rmk (xnu_mod_SOURCES): Remove loader/i386/efi/xnu.c.
* include/grub/i386/xnu.h (grub_xnu_set_video): Removed.
* loader/i386/efi/linux.c (grub_linux_setup_video): Copied from
loader/i386/pc/linux.c.
(grub_linux_boot): Resynced with loader/i386/pc/linux.c.
(find_line_len): Removed.
(find_framebuf): Likewise.
(grub_cmd_linux): Declare grub_linux_boot as possibly returning.
* loader/i386/efi/xnu.c: Removed.
* loader/i386/pc/xnu.c: Moved from here...
* loader/i386/xnu.c: ...here.