Port shared core and platform services to native pointer widths

src/boot/boot.multiboot.pas

@@ -14,6 +14,7 @@
 
 { Multiboot v1 wire layout: fixed-width fields on every architecture. }
 unit boot.multiboot;
+
 interface
 const MULTIBOOT_BOOTLOADER_MAGIC = $2BADB002;
 type
@@ -71,5 +72,7 @@ type
 		      mtype: uint32;
         end;
 
+var multibootinfo: Pmultiboot_info_t = nil;
+
 implementation
 end.