Split ufs.mod into ufs1.mod and ufs2.mod.

	* conf/common.rmk (grub_probe_SOURCES): Add fs/ufs2.c.
	(grub_fstest_SOURCES): Likewise.
	(pkglib_MODULES): Remove ufs.mod. Add ufs1.mod and ufs2.mod.
	(ufs_mod_SOURCES): Remove.
	(ufs_mod_CFLAGS): Likewise.
	(ufs_mod_LDFLAGS): Likewise.
	(ufs1_mod_SOURCES): New variable.
	(ufs1_mod_CFLAGS): Likewise.
	(ufs1_mod_LDFLAGS): Likewise.
	(ufs2_mod_SOURCES): New variable.
	(ufs2_mod_CFLAGS): Likewise.
	(ufs2_mod_LDFLAGS): Likewise.
	* conf/i386-coreboot.rmk (grub_emu_SOURCES): Add fs/ufs2.c.
	* conf/i386-efi.rmk (util/i386/efi/grub-mkimage.c_DEPENDENCIES):
	Likewise.
	(grub_emu_SOURCES): Likewise.
	* conf/i386-ieee1275.rmk (grub_emu_SOURCES): Likewise.
	* conf/i386-pc.rmk (grub_emu_SOURCES): Likewise.
	(grub_setup_SOURCES): Likewise.
	* conf/powerpc-ieee1275.rmk (grub_emu_SOURCES): Likewise.
	* conf/sparc64.rmk (grub_emu_SOURCES): Likewise.
	(grub_setup_SOURCES): Likewise.
	* conf/x86_64-efi.rmk (util/i386/efi/grub-mkimage.c_DEPENDENCIES):
	Likewise.
	* fs/ufs2.c: New file.
	* fs/ufs.c: Separate UFS1 from UFS2 by using preprocessor.