Adjustment to cc65 change.
Merge pull request #668 from oliverschmidt/master

Adjustment to cc65 change.
Added the new engine to mcast headers files
Added new engine files
Added subscriber linkaddr to mcast entry. Modify add mcast entry as well
Some fixes in BMRF engine configuration
First implementation of BMRF engine
Some fixes for incompatible data type and in function declaration
Fixing compiling errors
Changed lladdr comparision
Changed link layer address copy in route addition
Solved warnings for incompatible variable and pointer types
Cleaning code
Solved an error in mcast route addition when the entry already exists