[changeset] fixed typo for text obj fontunits property

[Ben Abbott]

This changeset correct's a typo in graphics.h.in for the text object  
property "fontunits". The value "pixel" is present, but it should be  
"pixels".

	(-): radio_property fontunits , "inches|centimeters|normalized| 
{points}|pixel"

	(+): radio_property fontunits , "inches|centimeters|normalized| 
{points}|pixels"

Ben

changeset-fontunits=pixels.patch
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