Directory for Linux (or possibly *nix in some cases) specific stuff.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2409 86ba831e-150c-0410-ab35-e06eaae15ed9
Move i_cpu_posix.cpp from source/sdl to source/linux

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2410 86ba831e-150c-0410-ab35-e06eaae15ed9
Updated source/CMakeLists.txt for new file layout.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2411 86ba831e-150c-0410-ab35-e06eaae15ed9
osx: Removed some dead weight from the project (i_cpu_posix.cpp, now moved elsewhere in the file system, wasn't required).

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2412 86ba831e-150c-0410-ab35-e06eaae15ed9