The process of dedicating a piece of work under the public domain is not the
same under different legal systems. It is possible that different rights are
given away depending on the origin. Sometimes even the dedication of the work
under public domain is not possible at all. CC0 tries to provide an explicit
way to waive all rights to still provide a secure way for other parties to use
this work [1] and provides a fallback when parts of the license may be judged
invalid under any jurisdiction.
[1] http://creativecommons.org/about/cc0
This only affects long's which are used on an 64-bit system. The zilmar spec
with its DWORD is not touched because on 32 bit it is always 32 bit for common
systems. On Win64 systems it is also 32 bit because Microsoft adopted LLP64.
All other systems seem to use LP64 (IL32LP64), ILP64 or SILP64.
ILP64 and SILP64 would also need to have shorts and int (when the code expects
32 bit) to be changed to (u)int*_t counterparts. This is not done in here.