Remove crc.mod and move crc command to hashsum.mod.

	Remove crc.mod and move crc command to hashsum.mod.
	Remove lib/crc.c - users updated to use gcrypt implementation.

	* grub-core/commands/crc.c: Removed.
	* grub-core/Makefile.core.def (crc): Module removed.
	* grub-core/commands/hashsum.c (aliases[]): Add crc alias.
	* grub-core/commands/hashsum.c (GRUB_MOD_INIT): Register crc command.
	* grub-core/commands/hashsum.c (GRUB_MOD_FINI): Unregister crc command.
	* grub-core/lib/crc.c: Removed.
	* include/grub/lib/crc.h: Removed.
	* Makefile.util.def (crc): Remove lib/crc.c
	* grub-core/Makefile.core.def (libgrub.a): Remove grub-core/lib/crc.c.
	* util/grub-fstest.c (cmd_crd): Use libgcrypt crc implementation.
	* Makefile.util.def (libgrub.a): Add grub-core/lib/libgcrypt-grub/cipher/crc.c.
	* Makefile.util.def (grub-fstest): Add CFLAGS_GCRY to cflags.
	* Makefile.util.def (grub-fstest): Add CPPFLAGS_GCRY to cppflags.
	* grub-core/efiemu/prepare.c (grub_efiemu_crc): Use libgcrypt crc implementation.