upgpkg: libpng 1.6.12-1


git-svn-id: file:///srv/repos/svn-packages/svn@215527 eb2447ed-0c53-47e4-bac8-5bc4a241df78
archrelease: copy trunk to testing-i686, testing-x86_64

git-svn-id: file:///srv/repos/svn-packages/svn@215528 eb2447ed-0c53-47e4-bac8-5bc4a241df78