Dropping support for Visual Studio 2008 in master branch

[Tor Lillqvist]

Unless somebody can give a *really* good reason, I plan to explicitly drop
support for building the master branch with MSVS 2008 soon.

It might be that this support was already unintentionally broken earlier
today or yesterday, and it would be easiest to just follow up and do it
completely.

Note that already the TDF 4.0 build has been built with MSVS 2010.

--tml
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