CI: Download, compile and use latest cppcheck version #1310
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Instead of using a dated version of "cppcheck" from the runner image, we download the latest release of "cppcheck" and build it.
As building it takes a few minutes, the build result is cached to be re-used in succeeding build runs.
This should make us aware of failed checks in recent "cppcheck" versions quicker. Currently we notice these mostly only when running "make check" locally or when the nightly builds for Debian Unstable fail because they also use recent "cppcheck" versions.
Currently the build fails because of the pending changes in #1309, once this is merged, the build should succeed.