update kernels 3.0, 3.2, 3.4, 3.8 and 3.9-rc
graphviz: bump to 2.30.1 (and try to fix broken font on non-NixOS)

Broken font is seen on Ubuntu. This doesn't help and I've seen other
apps with broken fonts, so I guess its a common problem.

I'll probably revert the new buildInputs before sending a pull-request.