* geninitheader.sh: Process file specified in first parameter rather
	than hardcoding grub_modules_init.lst.
	* geninit.sh: Likewise.  Also, construct header name dynamicaly rather
	than hardcoding grub_modules_init.h.

	* conf/common.rmk: Rename grub_modules_init.[ch] files associated with
	grub-emu to grub_emu_init.[ch].  Add rules to build analogous
	grub_probe_init.[ch] and grub_setup_init.[ch].

	* conf/powerpc-ieee1275.rmk (grub_emu_DEPENDENCIES): Replace
	grub_modules_init.h with grub_emu_init.h.
	(grub_probe_DEPENDENCIES, grub_probe_SOURCES): Add new
	grub_probe_init.[ch] files.
	* conf/i386-efi.rmk: Likewise.
	* conf/i386-pc.rmk: Likewise.
	(grub_setup_DEPENDENCIES, grub_setup_SOURCES): Add new
	grub_setup_init.[ch] files.

	* util/grub-emu.c: Replace grub_modules_init.h with grub_emu_init.h.
	* util/grub-probe.c: Include grub_probe_init.h.  Use grub_init_all()
	to initialize modules rather than a list of hardcoded functions.
	* util/i386/pc/grub-setup.c: Include grub_setup_init.h.  Use
	grub_init_all() to initialize modules rather than a list of hardcoded
	functions.