[gl2ps] Memory Leak

[Micha Bieber]

> Hi Jason - Indeed, looks looks like a memory leak to me too. And I
> cannot remember why we need to make a deep copy of the primitives in 
> this pdfprimlist in the first place... Micha, any insights?

I haven't the newest version here, but older ones (cf. v1.1.2) still
contain somewhat similar code (like the fixed example, provided from
Jason). So, someone did premature optimizations along the way :->

Micha  
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