Update setup.py to handle unknown boards
Update setup.py to handle unknown boards

yunqu/PYNQ,cathalmccabe/PYNQ,schelleg/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ,yunqu/PYNQ,schelleg/PYNQ,cathalmccabe/PYNQ,yunqu/PYNQ,Xilinx/PYNQ,Xilinx/PYNQ,yunqu/PYNQ,Xilinx/PYNQ,schelleg/PYNQ,schelleg/PYNQ,yunqu/PYNQ,cathalmccabe/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,schelleg/PYNQ,Xilinx/PYNQ