std C/C++ patch #9

[Eddie Kohler]

In fact, I believe the C++ standard forces 
sizeof(unpacked click_ether) == 16 on a four-byte-alignment machine:

5.3.3 par.2:
   ... When [operator sizeof is] applied to a class, the result is the
   number of bytes in an object of that class including any padding
   required for placing objects of that type in an array.

Eddie