[boost] [thread] regressions for msvc-8.0 x64

I am unsure how this "regression" should be handled. Since this _is_ a new compiler it is not really a regression, but on the other hand the compilers toolset name is the same as for x32. 1) Is there a way to explicitly markup as expected to fail conditioned on x64 ? 2) I do not have yet an x64 compiler so I will not be able to implement the tss cleanup for static linking for 1.34. I'll do this later. Roland