Fix the following error:
error: unused function 'l3fwd_simple_forward'
The l3fwd_simple_forward() is maybe unused, due to compilation options
(APP_LOOKUP_METHOD, ENABLE_MULTI_BUFFER_OPTIMIZE). As the combinatorial
is quite big, it looks simpler to add the __attribute__((unused)) on
this function, so that the compiler does not complain.
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
74cc294485