tests/pkg_micro-ecc: blacklist 16bits boards
tests/pkg_micro-ecc: blacklist 16bits boards

Test breaks on wsn430 boards with the node rebooting.

This must come becauso `micro-ecc` does not have 16b support.
I also blacklisted the other 16bits boards.

 * https://github.com/kmackay/micro-ecc/issues/96

smlng/RIOT,OTAkeys/RIOT,mtausig/RIOT,basilfx/RIOT,aeneby/RIOT,toonst/RIOT,toonst/RIOT,mfrey/RIOT,mfrey/RIOT,smlng/RIOT,lazytech-org/RIOT,authmillenon/RIOT,miri64/RIOT,kaspar030/RIOT,OTAkeys/RIOT,jasonatran/RIOT,josephnoir/RIOT,mtausig/RIOT,rfuentess/RIOT,ant9000/RIOT,mtausig/RIOT,A-Paul/RIOT,A-Paul/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,BytesGalore/RIOT,rfuentess/RIOT,aeneby/RIOT,smlng/RIOT,RIOT-OS/RIOT,BytesGalore/RIOT,kYc0o/RIOT,biboc/RIOT,basilfx/RIOT,miri64/RIOT,x3ro/RIOT,OlegHahm/RIOT,BytesGalore/RIOT,yogo1212/RIOT,lazytech-org/RIOT,authmillenon/RIOT,biboc/RIOT,smlng/RIOT,OTAkeys/RIOT,kaspar030/RIOT,smlng/RIOT,cladmi/RIOT,x3ro/RIOT,gebart/RIOT,cladmi/RIOT,mfrey/RIOT,authmillenon/RIOT,lazytech-org/RIOT,kYc0o/RIOT,josephnoir/RIOT,cladmi/RIOT,ant9000/RIOT,rfuentess/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,x3ro/RIOT,x3ro/RIOT,rfuentess/RIOT,A-Paul/RIOT,josephnoir/RIOT,basilfx/RIOT,OlegHahm/RIOT,kaspar030/RIOT,kYc0o/RIOT,josephnoir/RIOT,cladmi/RIOT,kaspar030/RIOT,BytesGalore/RIOT,ant9000/RIOT,authmillenon/RIOT,lazytech-org/RIOT,ant9000/RIOT,mfrey/RIOT,biboc/RIOT,yogo1212/RIOT,yogo1212/RIOT,josephnoir/RIOT,gebart/RIOT,cladmi/RIOT,RIOT-OS/RIOT,mfrey/RIOT,biboc/RIOT,jasonatran/RIOT,toonst/RIOT,gebart/RIOT,mtausig/RIOT,OTAkeys/RIOT,kaspar030/RIOT,aeneby/RIOT,ant9000/RIOT,aeneby/RIOT,mtausig/RIOT,authmillenon/RIOT,biboc/RIOT,miri64/RIOT,miri64/RIOT,basilfx/RIOT,yogo1212/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,toonst/RIOT,aeneby/RIOT,A-Paul/RIOT,x3ro/RIOT,jasonatran/RIOT,OlegHahm/RIOT,yogo1212/RIOT,basilfx/RIOT,toonst/RIOT,BytesGalore/RIOT,kYc0o/RIOT,authmillenon/RIOT,yogo1212/RIOT,gebart/RIOT,miri64/RIOT,gebart/RIOT,jasonatran/RIOT,lazytech-org/RIOT,A-Paul/RIOT,rfuentess/RIOT