#161 'opts' variable not initialized in resources/scripts/build/boot/roms

With the latest code version as of 25th March 2023, it is not possible to build the roms using parameters such as -p, -d, or -k When using one of these options, you get an error about "opts" not set. Looking into the resource/scripts/build/boot/roms file, the section parsing the options is trying to set the value for the "opts" variable, but that variable is not being initialized in advance. I've inserted opts="" just before the while loop and that made things work.