Migrate to modern poppler APIs

[Daniel Macks]

Following up from Bug #168980, which found that inkscape is using the "xpdf" interface to poppler... Xpdf is a legacy library, ancestor to poppler. Poppler still provides this legacy interface, but it's an optional feature that must be explicitly enabled when building poppler. So for modern use and easier building of inkscape by end users, this is a feature request to upgrade the pdfinput extension to use the direct/native poppler interfaces.

[su_v (suv-lp)]

Related to or duplicate of
Bug #254849 “Inkscape requires poppler internal private headers”
<https://bugs.launchpad.net/inkscape/+bug/254849>

See also
<http://wiki.inkscape.org/wiki/index.php/Compiling_Inkscape#Poppler>
«Some Linux distributions do not ship the Xpdf headers required by Inkscape. In such cases, you need to recompile Poppler, passing --enable-xpdf-headers on the configure line. See this wishlist bug [1]»

[1] <https://bugs.launchpad.net/inkscape/+bug/254849>