Support mmap-ing dynamic data on win32 about cld2 HOT 5 OPEN

For now, the answer is going to be that loading/unloading from a file is not 
going to work. Instead, Windows support will have to be limited to the "raw" 
modes:

Instead of CLD2::loadDataFromFile, use CLD2::loadDataFromRawAddress. It is up 
to the caller to figure out how to get that raw pointer to point to the correct 
thing, presumably using CreateFileMapping and associate functions.

Internally, these methods will be disabled for win32:
CLD2DynamicDataLoader::loadDataFile
CLD2DynamicDataLoader::unloadDataFile

Instead, use these if needed:
CLD2DynamicDataLoader::loadDataRaw
CLD2DynamicDataLoader::unloadDataRaw

We should really also have an MSVC project file for building CLD2 on Windows. 
Contributions welcome, as I have no experience with MSVC.

Windows support for data file disabled in r166. Use raw modes instead, as 
described above. This should keep windows compilers happy.

Clarifying subject, since raw mode SHOULD work on Windows. It's only file mode 
that is disabled.