* gnulib/progname.h: Likewise.
* conf/i386-pc.rmk (grub_mkimage_SOURCES): Add `gnulib/progname.c'.
* util/i386/pc/grub-mkimage.c: Include `"progname.h"'.
(usage): Replace `progname' with `program_name'.
(main): Use set_program_name() for program name initialization.