logorenderer files not being installed

Original bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768300

When building examples textureinsgnode and textureinthread in qtcreator, you get the error 'fatal error: logorenderer.h: No such file or directory'.
This is because the /usr/lib/i386-linux-gnu/qt5/examples/quick/scenegraph/shared directory is missing, which contains the files logorenderer.h and logorenderer.cpp. These files are also not included in other debian packages.

Maintainer note: the files are not present in the packaging because they are not being installed by the build system.