The latest spec allows this to be omitted iff there is a blinded path
and it would be made up anyway.
In that case, the key they will use to sign the invoice will be the final
blinded key in the path we use.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).
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