* util/i386/pc/grub-mkrescue.in: Pad both floppy images with zeroes, not just the cdrom one.
* util/i386/pc/grub-mkrescue.in: Add "set -e". Add --pkglibdir=DIR option to override pkglibdir. Mention --image-type=TYPE in help output. Fix --grub-mkimage (it was a no-op). Abort gracefuly when no parameter is given.
* util/i386/pc/grub-mkrescue.in: New file. * conf/i386-pc.rmk: Add its build declarations. Put it in bin_SCRIPTS. * Makefile.in: Handle bin_SCRIPTS.