[poppler] custom POPPLER_DATADIR (at runtime)

[Jonathan Kew]

I'd like to be able to set the POPPLER_DATADIR at runtime from the  
application using poppler, rather than having this fixed at configure  
time; this would be particularly helpful for building standalone,  
relocatable applications for platforms such as Windows and Mac.

A simple way to allow this, I think, would be to add an optional path  
parameter to the GlobalParams constructor; this will default to NULL,  
in which case the existing behavior will be unchanged, but if the  
client passes a string here then that will be used in place of the  
compiled-in path.

The attached patch attempts to do this; please consider adding this,  
or some other way to achieve the same goal. Thanks!

Jonathan

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