vnc: tight: specific zlib level and filters for each compression level

vnc: tight: specific zlib level and filters for each compression level

Disable png filters for lower compression levels. This should lower
the CPU consumption and reduce encoding time.

This isn't in tight_conf because:
* tight_conf structure must not change, because it's shared with other
  tight implementations (libvncserver, etc..).
* it'd exceed the 80 col limit.
* PNG_ macros are only defined if CONFIG_VNC_PNG is defined

Signed-off-by: Corentin Chary <[email protected]>
Signed-off-by: Anthony Liguori <[email protected]>