[poppler] Fix building static libraries with cmake

[suzuki toshiya]

Dear Albert,

At least, in my case, archive library of poppler works to use
pdftoppm, pdftotext and pdftocairo. The binaries linking libpoppler
statically are useful for debugging, so I want to support the
patch by Jeroen. Which features would be failed in the binary
linking libpoppler statically?

Regards,
mpsuzuki

Albert Astals Cid wrote:
> El dijous, 2 de novembre de 2017, a les 13:53:16 CET, Jeroen Ooms va escriure:
>> On Thu, Nov 2, 2017 at 12:23 AM, Albert Astals Cid <aacid at kde.org> wrote:
>>> Email here or use bugzillla.
>> OK, attached is the patch.
> 
> Does using static libraries for poppler actually work?
> 
> As far as i remember static linking of libraries means that static objects 
> defined in C++ dont' get created, so stuff will fail?
> 
> Cheers,
>   Albert
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