[Patch v2] build: add target to run cppcheck

[David Bremner]

Jani Nikula <jani at nikula.org> writes:
>
> I thought the quiet build lines like
>
> CPPCHECK .stamps/cppcheck/util/error_util.c
>
> were a bit ugly, so I came up with [1]. With that plus this change:
>
> -	$(call quiet,CPPCHECK) --template=gcc --error-exitcode=1 --quiet $<
> +	$(call quiet,CPPCHECK,$<) --template=gcc --error-exitcode=1 --quiet $<
>

series pushed, with this change

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