upgpkg: assimp 3.1-1

upstream release 3.1

git-svn-id: file:///srv/repos/svn-community/svn@111562 9fca08f4-af9d-4005-b8df-a31f2cc04f65
archrelease: copy trunk to community-i686, community-x86_64

git-svn-id: file:///srv/repos/svn-community/svn@111563 9fca08f4-af9d-4005-b8df-a31f2cc04f65