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This patch updates screen to version 4.2.1, released 2014/04/27. Signed-off-by: Luis Dallos <ld@nkvd.ignorelist.com> git-svn-id: svn://svn.openwrt.org/openwrt/packages@40607 3c298f89-4303-0410-b956-a3cf2f4a3e73