mate-panel uses libsoup indirectly through libmateweather, which already
requires libsoup-3.0. Evolution Data Server (used by the clock applet
for calendar integration) also requires libsoup-3.0.

There are no distros (that I could find) that ship both an old
libwnck<3.32.0 with a new MATE>=1.28. Dropping this should be safe and
removes complexity.

Since all of these were already wrapped inside HAVE_X11, it should not
affect Wayland at all.

Otherwise different jobs seem to overwrite each other, loosing part of
their cache.

Teach cppcheck the C11 _Noreturn attribute.

Give it relevant -D/-I flags so it can perform more useful checks.
This makes if slower, but hopefully more accurate and useful.