And turn "" includes into full-path (which makes it easier to put
config.h first, and finds some cases check-includes.sh missed
previously).
config.h sets _GNU_SOURCE which really needs to be done before any
'#includes': we mainly got away with it with glibc, but other platforms
like Alpine may have stricter requirements.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I wante to hide it inside the library, but it is good to have a single
place to verify that the client was permitted to send a message we are
handling, so make it officially part of the interface by prefixing it.
These are currently just shims that replicate the old behavior, but
when compiling as a library we can relink the status_* functions to
something that makes sense in the context of the user, and not assume
we're running as a subdaemon.
