#328 SConstruct various fixes for Win64 MSVC patch

[viwrap]

• Fixes typo win64-mvc
• Adds win64-msvc to accepted scons parameters
• Fix inconsistent spaces and tabs
• Only override CC/CXX when msvc is not the selected platform
• Fix version format for MSVC linker option
• Fix x84 typo when selecting DX9 on x64 platforms
• Dump compile commands for non-MSVC platforms

[Michael Zeilfelder]

Thanks for the patch. Applied in svn r6733