Re: [Cin] zimg 2.8

@Stefan Thanks for the hint. I had done the copy/paste from bld_appimage.sh which indeed reports the error (@Phyllis: better correct this error?). The compilation starts but stops with an error. I did a new build with the 2 patches. This time the build happens without any problems. The zscale plugin is present, but it keeps getting the usual error when I change the color parameters. PluginFVClient::process_buffer() F_zscale err: Generic error in an external library