[poppler] [PATCH] Do not force checkboxes to change in unison

[Michael Vrable]

I've been having trouble with checkboxes in some PDF forms.  
Specifically, in http://www.irs.gov/pub/irs-pdf/f1040.pdf there are some 
groups of checkboxes (such as near line 1 and after line 77).  In these 
groups with the current poppler head, selecting one of the checkboxes 
causes all of them to be drawn as selected, which is not the desired 
behavior.

The attached patch should be a fix for this problem.  I've tried to keep 
it simple.

(Longer-term, I've been wondering if it is better to use the appearance 
streams in the appearance dictionary for drawing the checkbox states, if 
available, instead of always regenerating the check ourselves.  But that 
is a larger change, so I've avoided it for the moment.)

--Michael Vrable
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