Header changes in master broke this upon rebase :(
```
In file included from ./channeld/full_channel.h:5,
from tests/fuzz/fuzz-full_channel.c:7:
./channeld/channeld_htlc.h:13:28: error: field ‘amount’ has incomplete type
13 | struct amount_msat amount;
| ^~~~~~
./channeld/channeld_htlc.h:17:23: error: field ‘rhash’ has incomplete type
17 | struct sha256 rhash;
| ^~~~~
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
815ac7e309