Fix type mismatch with Poppler 0.86.

Taken from Arch Linux:
https://git.archlinux.org/svntogit/packages.git/tree/trunk/libreoffice-poppler-0.86.patch?h=packages/libreoffice-fresh

diff --git a/sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.cxx b/sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.cxx
--- a/sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.cxx
+++ b/sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.cxx
@@ -563,7 +563,9 @@ void PDFOutDev::processLink(Link* link, Catalog*)
     if (!(pAction && pAction->getKind() == actionURI))
         return;
 
-#if POPPLER_CHECK_VERSION(0, 72, 0)
+#if POPPLER_CHECK_VERSION(0, 86, 0)
+    const char* pURI = static_cast<LinkURI*>(pAction)->getURI().c_str();
+#elif POPPLER_CHECK_VERSION(0, 72, 0)
     const char* pURI = static_cast<LinkURI*>(pAction)->getURI()->c_str();
 #else
     const char* pURI = static_cast<LinkURI*>(pAction)->getURI()->getCString();