changed HDL_BUILD_DIR to RADIOHDL_BUILD_DIR

...ard1/designs/unb1_test/revisions/unb1_test_all/hdllib.cfg

...ard1/designs/unb1_test/revisions/unb1_test_ddr/hdllib.cfg

...gns/unb1_test/revisions/unb1_test_ddr_16g_MB_I/hdllib.cfg

...ns/unb1_test/revisions/unb1_test_ddr_16g_MB_II/hdllib.cfg

.../unb1_test/revisions/unb1_test_ddr_16g_MB_I_II/hdllib.cfg

...designs/unb1_test/revisions/unb1_test_ddr_MB_I/hdllib.cfg

...esigns/unb1_test/revisions/unb1_test_ddr_MB_II/hdllib.cfg

...igns/unb1_test/revisions/unb1_test_ddr_MB_I_II/hdllib.cfg

boards/uniboard1/designs/unb1_tr_10GbE/hdllib.cfg

...uniboard1/libraries/unb1_board/unb1_board.peripheral.yaml

boards/uniboard2/designs/unb2_minimal/hdllib.cfg

...d2/designs/unb2_test/revisions/unb2_test_10GbE/hdllib.cfg

...rd2/designs/unb2_test/revisions/unb2_test_1GbE/hdllib.cfg

...ard2/designs/unb2_test/revisions/unb2_test_all/hdllib.cfg

...designs/unb2_test/revisions/unb2_test_ddr_MB_I/hdllib.cfg

...esigns/unb2_test/revisions/unb2_test_ddr_MB_II/hdllib.cfg

...igns/unb2_test/revisions/unb2_test_ddr_MB_I_II/hdllib.cfg

boards/uniboard2a/designs/unb2a_heater/hdllib.cfg

boards/uniboard2a/designs/unb2a_minimal/hdllib.cfg

.../designs/unb2a_test/revisions/unb2a_test_10GbE/hdllib.cfg