CMakeLists.txt: Update for new subdirectory names
client: Update CMakeLists.txt

- Remove SFML as dependency
- Add parent directory to include search paths
- Specify which source files to build, as some source files are
  not in working condition.
nx: Include <cstddef> in lz4.hpp

size_t is defined in <cstddef>
GCC does not know what size_t is, unless it is included.
client/CMakeLists.txt: Remove boost_regex dependency

It looks like GCC 4.8.2 backported the <regex> implementation
client/CMakeLists.txt: Completely remove boost from dependencies
nx/lz4.hpp: Remove whitespace between preprocessor directives
client/CMakeLists.txt: Remove X11 detection
CMakeLists.txt: Add new line at end of file
Merge pull request #7 from crumblingstatue/master

Make NoLIfeClient build on Linux