the function CSIDevice_GCController::GetNetInput is not available if Dolphin is compiled without the GUI.
This patch disables the use of it, if USE_WX == 0.
If Source/Core/DolphinWX/Src/NetFunctions.cpp is supposed to be compiled when wx is disabled then this patch is wrong.
If so, NetFunctions.cpp has to be always compiled and all wx dependent functionality has to be disabled if USE_WX == 0.
This patch disables the use of it, if USE_WX == 0.
If Source/Core/DolphinWX/Src/NetFunctions.cpp is supposed to be compiled when wx is disabled then this patch is wrong.
If so, NetFunctions.cpp has to be always compiled and all wx dependent functionality has to be disabled if USE_WX == 0.