Emulator

Dolphin doesn't build anymore with wxWidgets 2.9.4 since https://github.com/dolphin-emu/dolphin/commit/90df5efd01782847f6427efa552b4a2a5a007413 .

I'd personally like keeping compatibility since openSUSE yet doesn't include wxw3 packages. I'm not sure if that applies to any stable releases of common distributions (other than those which are bleeding edge anyway). Debian stable does not; Ubuntu 14.04 does, so do Debian testing, Fedora>=19 and Arch.

We have two options to deal with this:
a) revert the commit mentioned above. I tested this out locally, it only requires fixing a small conflict and build works perfectly fine after that.
b) drop support for wxWidgets < 3.0 from CMakeLists.txt

Marked as milestone current because this is sort of relevant for packaging.