Editing the .config file with nano within the coreboot folder and setting CONFIG_USE_BLOBS to N, then running a make clean and then make has allowed it to compile. Whether it will work or not is a different question.
Another error?
CREATE build/mainboard/nintendo/switch/cbfs-file.6CX2Zd.out (from /home/ben/coreboot/.config)
make: *** No rule to make target 'tegra_mtc.bin', needed by 'build/coreboot.pre'. Stop.