Merge branch 'master', remote-tracking branch 'upstream/master'
conf-* pkg to explicit dependency to C++ lib SFML2
conf-* pkg to explicit dependency to C lib SDL2
conf-* pkg to explicit dependency to C lib ODE
conf-* pkg to explicit dependency to ImageMagick C lib
Merge pull request #959 from blue-prawn/master

added conf-* pkgs to explicit dependency to some C libs