x11-toolkits/como: unbreak consumers with clang 19

In file included from theseus-ship-6.2.0/main_wayland.cpp:10:
In file included from /usr/local/include/como/base/wayland/xwl_platform.h:17:
/usr/local/include/como/render/wayland/xwl_platform.h:268:19: error: no member named 'addRepaintFull' in 'xwl_platform<Base>'; did you mean 'addRepaint'?

268 |             this->addRepaintFull();
    |                   ^

/usr/local/include/como/render/wayland/xwl_platform.h:233:10: note: 'addRepaint' declared here

233 |     void addRepaint(QRegion const& region)
    |          ^

Reported by: pkg-fallout