dl/elf: Use format code PRIxGRUB_UINT64_T for 64-bit arg in grub_error()

The macro ELF_R_TYPE does not change the underlying type. Here its argument
is a 64-bit Elf64_Xword. Make sure the format code matches.

For the RISC-V architecture, rel->r_info could be either Elf32_Xword or
Elf64_Xword depending on if 32 or 64-bit RISC-V is being built. So cast
to 64-bit value regardless.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/kern/ia64/dl.c

@@ -137,7 +137,8 @@ grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
 	  break;
 	default:
 	  return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
-			     N_("relocation 0x%x is not implemented yet"),
+			     N_("relocation 0x%" PRIxGRUB_UINT64_T
+				" is not implemented yet"),
 			     ELF_R_TYPE (rel->r_info));
 	}
     }