Use SCons' convenient # shorthand for the root of our tree.
Also various minor cleanup of SConscripts.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5915 8ced0084-cf51-0410-be5f-012b33b47a6e
I hope I didn't break the mac+linux builds - if i did, fixing it should be a simple matter of adjusting the sconscripts.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5661 8ced0084-cf51-0410-be5f-012b33b47a6e