pkg/ubasic: blacklist unsupported architectures
pkg/ubasic: blacklist unsupported architectures

AVR8, MSP430, RISV and MIPS are excluded because of missing features in their respective toolchains

kaspar030/RIOT,x3ro/RIOT,basilfx/RIOT,toonst/RIOT,kaspar030/RIOT,aeneby/RIOT,jasonatran/RIOT,miri64/RIOT,ant9000/RIOT,miri64/RIOT,josephnoir/RIOT,x3ro/RIOT,toonst/RIOT,kaspar030/RIOT,basilfx/RIOT,yogo1212/RIOT,x3ro/RIOT,mtausig/RIOT,mtausig/RIOT,x3ro/RIOT,OlegHahm/RIOT,mtausig/RIOT,aeneby/RIOT,josephnoir/RIOT,aeneby/RIOT,x3ro/RIOT,OTAkeys/RIOT,aeneby/RIOT,smlng/RIOT,toonst/RIOT,OTAkeys/RIOT,toonst/RIOT,aeneby/RIOT,authmillenon/RIOT,yogo1212/RIOT,authmillenon/RIOT,yogo1212/RIOT,basilfx/RIOT,ant9000/RIOT,ant9000/RIOT,kYc0o/RIOT,ant9000/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,kaspar030/RIOT,josephnoir/RIOT,kaspar030/RIOT,kYc0o/RIOT,yogo1212/RIOT,smlng/RIOT,jasonatran/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,basilfx/RIOT,authmillenon/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,ant9000/RIOT,basilfx/RIOT,mtausig/RIOT,smlng/RIOT,josephnoir/RIOT,smlng/RIOT,miri64/RIOT,authmillenon/RIOT,kYc0o/RIOT,mtausig/RIOT,OlegHahm/RIOT,smlng/RIOT,miri64/RIOT,jasonatran/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,yogo1212/RIOT,toonst/RIOT,miri64/RIOT,OTAkeys/RIOT,yogo1212/RIOT,kYc0o/RIOT,authmillenon/RIOT,OlegHahm/RIOT,jasonatran/RIOT,OTAkeys/RIOT