cmake POPPLER_HAS_XPDF examples

TeXworks/texworks modules/QtPDF/CMakeLists.txt :309 

get_target_property(POPPLER_HAS_XPDF Poppler::poppler HAS_PRIVATE_HEADERS)

TeXworks/texworks modules/QtPDF/CMakeLists.txt :326 

endif (POPPLER_HAS_XPDF)