parser: fix GCC 6 warnings

parser: fix GCC 6 warnings

src/parser.c:450:30: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
       void * src = &((struct sockaddr_in *)(void *)&from)->sin_addr;
                              ^~~~~~~~~~~
src/parser.c:454:30: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
       void * src = &((struct sockaddr_in6 *)(void *)&from)->sin6_addr;
                              ^~~~~~~~~~~~

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>