Advantages:
* Less confusion for users
* No need to build twice to make sure you didn't break something
* Easier to switch between the cores for testing
Disadvantages:
* None, as far as I can tell :) Maybe some extra code complexity, but not much.
Also break some include chains that caused <windows.h> to get included into everything, slowing down the build on Windows. There's more to do here though, there's still a lot of files that get it included that don't need it at all.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4891 8ced0084-cf51-0410-be5f-012b33b47a6e
