client/CMakeLists.txt: Build portal.cpp
nx/CMakeLists.txt: Link with lz4
wztonx/CMakeLists.txt: Link with lz4
client/CMakeLists.txt: Use find_package for glfw instead of hardcoded library name
nx: Use windows.h if building on MinGW
Merge pull request #15 from crumblingstatue/master

Pull me