* add preliminary support for building Blender on 64bit Windows with _msvc_. The SConstruct should automatically detect if you are on a 64bit Windows and if you have that 64bit build is assumed. If you're not, 32bit build is assumed.
NOTE: this is still very much wip, so your mileage may vary. Do please report on b25 taskforce ML in case of trouble.
NOTE2: many of the libs are being linked in statically
NOTE3: hopefully I didn't break anything for other build platforms (mingw, linux, osx).
NOTE4: comes after NOTE3