* Rbuild MSVC Backend changes:
- Don't do runtime checks for drivers
- Don't do buffer checks for drivers
- Use W0 for speed build, not for the release build.
- Disable Wp64 only for the speed build, not for the release build
- Use /STDCALL default calling convention for native modules because the DDK requires it
- Remove some duplicated options that were passed on the command line
- Replace some options that were passed on the commandline with their appropriate XML keywords.
svn path=/trunk/; revision=20637