Hopefully I didn't delete too much this time.

src/CMakeLists.txt

src/d_net.c

src/d_net.h

src/d_netmobj.c

src/d_netmobj.h

src/i_net.h

src/i_tcp.c

src/i_tcp.h

src/sdl/CMakeLists.txt

src/sdl/i_net.c

src/sdl12/i_net.c