gnu: libreoffice: Fix build with Poppler 0.86.

* gnu/packages/patches/libreoffice-poppler-compat.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/libreoffice.scm (libreoffice)[source](patches): New field.

gnu/local.mk

@@ -1143,6 +1143,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/libmpeg2-global-symbol-test.patch	\
   %D%/packages/patches/libmygpo-qt-fix-qt-5.11.patch		\
   %D%/packages/patches/libmygpo-qt-missing-qt5-modules.patch	\
+  %D%/packages/patches/libreoffice-poppler-compat.patch		\
   %D%/packages/patches/libsndfile-armhf-type-checks.patch	\
   %D%/packages/patches/libsndfile-CVE-2017-8361-8363-8365.patch	\
   %D%/packages/patches/libsndfile-CVE-2017-8362.patch		\

gnu/packages/libreoffice.scm

@@ -1006,6 +1006,7 @@ (define-public libreoffice
         (string-append
          "https://download.documentfoundation.org/libreoffice/src/"
          (version-prefix version 3) "/libreoffice-" version ".tar.xz"))
+       (patches (search-patches "libreoffice-poppler-compat.patch"))
        (sha256
         (base32
          "06acm41q9nda8r30b13cn9zafsw1gszjdphh6lx90s09d2sf7f23"))))

gnu/packages/patches/libreoffice-poppler-compat.patch

@@ -0,0 +1,19 @@
+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();