* util/update-grub.in: Create device.map if it doesn't already exist, before attempting to run grub-probe. Check for grub-probe and grub-mkdevicemap with the same code grub-install is using. Remove test mode.
* util/update-grub.in: Create ${grub_prefix} if it doesn't exist.
* DISTLIST: Add util/update-grub.in, util/grub.d/00_header.in, util/grub.d/10_hurd.in, util/grub.d/10_linux.in and util/grub.d/README. * Makefile.in: Build update-grub_SCRIPTS. Install update-grub_SCRIPTS and update-grub_DATA. * conf/common.rmk: Build and install update-grub components. * conf/common.mk: Regenerate. * util/update-grub.in: New. Core of update-grub. * util/grub.d/00_header.in: New. Generates grub.cfg header. * util/grub.d/10_hurd.in: New. Generates boot entries for the Hurd. * util/grub.d/10_linux.in: New. Generates boot entries for Linux. * util/grub.d/README: New. Document grub.d directory layout.