* qt4/src/poppler-link-extractor-private.h:
       * qt4/src/poppler-link-extractor.cc:
       * qt4/src/poppler-page-private.h:
       * qt4/src/poppler-page.cc:
       * qt4/src/poppler-private.h:
       * qt4/src/poppler-qt4.h:
       Getting the links of a page now is not more dependant on the current
       output device, and can be done anytime; thus, the doLinks parameter
       of the Page::render() can be dropped.