glib: Make PrintPageRange preference available in API

Add poppler_document_get_print_page_ranges() so that applications which
use poppler's glib frontend can access this preference.

poppler/poppler#290
6 jobs for glib-viewer-preferences in 7 minutes and 16 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #354678
build

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passed #354683
build_android

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passed #354679
build_clang_libcpp

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passed #354682
build_clazy

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passed #354681
build_mingw64_fedora

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passed #354680
build_ubuntu_16_04

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