octoclock: Fix multi-line #define statements

Now, use `do{...} while(0)` to pack multiple statements
into a single one that isn't fragile.

Currently

```
if(state_just_right)
	OCTOCLOCK_SEND_AND_RECV(all,the,options);
```

would introduce annoying bugs.

Generally, there's no good reason this is a `#define` rather than a
C/C++ function.

The `OCTOCLOCK_PACKET_MATCHES` should probably be a C function, too,
or simply an overloaded `==` operator on to `const octoclock_packet_t&`.

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