Remove byte-swapping function calls, which are not valid in
structure initialisers.
* grub-core/partmap/gpt.c (grub_gpt_partition_type_bios_boot): Make
non-const.
(GRUB_MOD_INIT): Byte-swap data1, data2, and data3 fields of
grub_gpt_partition_type_bios_boot.
* grub-core/partmap/gpt.c (grub_gpt_partition_type_bios_boot)
[GRUB_UTIL]: New variable.
(gpt_partition_map_iterate): Set part.parent.
(gpt_partition_map_embed) [GRUB_UTIL]: New function.
(grub_gpt_partition_map) [GRUB_UTIL]: Set .embed.
* grub-core/partmap/msdos.c (pc_partition_map_embed) [GRUB_UTIL]:
New function.
(grub_msdos_partition_map) [GRUB_UTIL]: Set .embed.
* include/grub/partition.h (grub_embed_type_t) [GRUB_UTIL]: New type.
(grub_partition_map) [GRUB_UTIL]: New field embed.
* util/grub-setup.c (grub_gpt_partition_type_bios_boot): Removed.
(setup): Use ->embed.