Remove unused IEEE.STD_LOGIC_UNSIGNED, if necessary then should use IEEE.numeric_std.

libraries/io/tr_nonbonded/src/vhdl/tr_nonbonded.vhd

...s/technology/transceiver/sim_transceiver_deserializer.vhd

libraries/technology/transceiver/sim_transceiver_gx.vhd

...ies/technology/transceiver/sim_transceiver_serializer.vhd

.../technology/transceiver/tech_transceiver_gx_stratixiv.vhd