Fix the long-standing mkhive bug on 64-bit systems

Fix the long-standing mkhive bug on 64-bit systems

This is now done by adding a "typedefs64.h" header file, which uses int's instead of long's for 32-bit values. As far as I know, this is the only way to avoid the problem that a long has a size of 64-bit on 64-bit systems.
This header file is now used in the host makefiles of cmlib, inflib and mkhive. It is also suitable for the other host tools, which need 32-bit values (will do some changes there in the next few days).

Unfortunately, Live-CDs still do not work because of another bug (see bug #2290).
But I compared the hives created by 32-bit Debian Linux and 64-bit Debian Linux and after these changes, they are exactly the same.
See issue #2272 for more details.

svn path=/trunk/; revision=28389