sdrangel: opencv3 -> opencv4

+2 -2
+2 -2
pkgs/applications/radio/sdrangel/default.nix
··· 24 , libbladeRF 25 , mbelib 26 , ninja 27 - , opencv3 28 , pkg-config 29 , qtcharts 30 , qtdeclarative ··· 90 libusb1 91 limesuite 92 mbelib 93 - opencv3 94 qtcharts 95 qtdeclarative 96 qtgamepad
··· 24 , libbladeRF 25 , mbelib 26 , ninja 27 + , opencv4 28 , pkg-config 29 , qtcharts 30 , qtdeclarative ··· 90 libusb1 91 limesuite 92 mbelib 93 + opencv4 94 qtcharts 95 qtdeclarative 96 qtgamepad