Miscellaneous cppcheck tweaks
- Work around cppcheck 2.0 uninitvar false positives
- Make GCC version extraction work with GCC 10
- Ensure cppcheck creates a HTML report upon failure
The first item is the critical one as it addresses the problem which prevents us from rebuilding production Debian "buster" images (and we need to do that to address image content issues).
Edited by Michał Kępień