Shorten down version number by discarding the third number.

Fixes a "fatal error LNK1118: syntax error in 'VERSION' statement" compiler error that was silently ignored in previous versions of Visual C++ (http://stackoverflow.com/questions/20021950/def-file-syntax-error-in-visual-studio-2012).
Fix incorrect assembly path in Debug|x64 pre-build script.
Disable SAFESEH in Debug|Win32 and Release|Win32 to resolve the following linker errors:
match686.obj : error LNK2026: module unsafe for SAFESEH image.
inffas32.obj : error LNK2026: module unsafe for SAFESEH image.

These errors does not occur in x64, nor in the ReleaseWithoutAsm configurations, so there is no need to modify those.