check-patches: complain if title is longer than 72 characters

Although git commit titles can be a lot longer that 72 characters it is
sensible to limit it somewhere. Many people recommend a maximum of 50
characters, other places allow for slightly longer, github for examples
truncates titles at 72, our benevolent maintainer tries to aim for 60.
Considering the above 72 seems like a comfortable hard limit.

Signed-off-by: Bence Ferdinandy <bence@ferdinandy.com>
Reviewed-by: Moritz Poldrack <moritz@poldrack.dev>
Acked-by: Robin Jarry <robin@jarry.cc>

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