logger warning pragma disabled for linux.

git-svn-id: https://www.libavg.de/svn/trunk/libavg@9335 44470bb9-56e9-0310-a0f8-c586564d3dc6
Changed mipmap generation strategy (possible fix for #457.

git-svn-id: https://www.libavg.de/svn/trunk/libavg@9336 44470bb9-56e9-0310-a0f8-c586564d3dc6