[ccan] Two small ccanlint patches

[Timothy B. Terriberry]

The first fixes the example module documentation ccanlint outputs. The
missing \n meant that it would not validate its own example as valid
documentation (with no explanation of _why_ it was invalid... but that
would be a much larger patch).

The second makes the idempotent header check more liberal, and
specifically allows it to also recognize

#if !defined(someheader)
#define someheader (1)

or other similar variants.
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