pkg/libcoap: remove non existing include directory
pkg/libcoap: remove non existing include directory

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