ui/vnc: Only report/use TIGHT_PNG encoding if enabled.
If TIGHT_PNG is not enabled by the --enable-vnc-png configure flag then do not report to the client that it is supported. Also, since TIGHT_PNG is the same as the TIGHT encoding but with the filter/copy replaced with PNG data, adding it to the supported encodings list when it is disabled will cause the TIGHT encoding to be used even though the client requested TIGHT_PNG. Signed-off-by: NJoel Martin <github@martintribe.org> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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