We had a hack for 'struct rval' in protobuf_convert.h; make an
explicit header and put it in bitcoin/preimage.h. It's not really
bitcoin-specific, but it's better than having bitcoin/script depend on
an external header.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The union still contains all the types, but we can only print
the ones which are linked in.
This makes it much easier to use type_to_string in different binaries
without pulling in the world.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rusty Russell