The new runtest.py --cppcheck flag can be used in combination with
sources checked out earlier. The source checkout actions then
run cppcheck on each source tree and fail if cppcheck finds any
non-suppressed problems.
A wrapper around cppcheck must be used because --error-exitcode caused
non-zero exit codes also when errors where suppressed, at least in cppcheck
1.61.
We check the SyncEvolution source a bit more thoroughly than the rest because
we can fix or suppress issues inline, which might not be acceptable for
libsynthesis or activesyncd.
Patrick Ohly