xc2bit: Make port names in structure.rs 'static
xc2bit: Make port names in structure.rs 'static

rqou/openfpga,rqou/openfpga,azonenberg/openfpga,azonenberg/openfpga,azonenberg/openfpga,rqou/openfpga,rqou/openfpga,azonenberg/openfpga,rqou/openfpga,azonenberg/openfpga