VSConfig.cmd: add WIN32_OR_X64 and VS2008_OR_VS2010 utility variables.
Add x64 configurations to protobuf's VC10 solution and project files.
Add x64 configuration to zziplib's project file.
Remove pre/post-build event (removal of vc80.idb) that can potentially fail the whole zziplib build on when doing non-VC9 and non-32-bit build.
Add x64 configuration to libcelt.vcproj. Also add libcelt.vcxproj which will be used on VC >= 10.
Add x64 configurations for libspeex.sln.
BuildDeps.cmd: x64 build support for Obb, Vorbis, Celt, Speex, zlib and zziplib.
BuildDeps.cmd: better control for zlib and zziplib version. Fix typo in theora path check.