cpu/esp32: compile riot_freertos only if required
cpu/esp32: compile riot_freertos only if required


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