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This allows additional files in /etc/nginx/, such as SSL certificates, tobe saved on sysupgrade. Signed-off-by: Mark Mentovai <mark@moxienet.com> git-svn-id: svn://svn.openwrt.org/openwrt/packages@33271 3c298f89-4303-0410-b956-a3cf2f4a3e73