Fix build with Poppler 0.86 and later.

Taken from Arch Linux, but adjusted to patch the versioned Poppler
files, as upstream applies it after copying them in place.
https://git.archlinux.org/svntogit/packages.git/tree/trunk/texlive-poppler-0.86.patch?h=packages/texlive-bin

--- a/texk/web2c/pdftexdir/pdftoepdf-poppler0.76.0.cc	2020-03-03 21:11:35.102711802 +0000
+++ b/texk/web2c/pdftexdir/pdftoepdf-poppler0.76.0.cc	2020-03-03 21:13:13.057420111 +0000
@@ -757,7 +757,7 @@
     if (page_name) {
         // get page by name
         GString name(page_name);
-        LinkDest *link = pdf_doc->doc->findDest(&name);
+        LinkDest *link = pdf_doc->doc->findDest(&name).get();
         if (link == 0 || !link->isOk())
             pdftex_fail("PDF inclusion: invalid destination <%s>", page_name);
         Ref ref = link->getPageRef();
it' value='switch'/></form></td></tr>
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<div class='path'>path: <a href='/guix/log/?id=4107a56e73776c6c3d51c49f54c9a2ae96fdcd1e'>root</a>/<a href='/guix/log/gnu?id=4107a56e73776c6c3d51c49f54c9a2ae96fdcd1e'>gnu</a>/<a href='/guix/log/gnu/ci.scm?id=4107a56e73776c6c3d51c49f54c9a2ae96fdcd1e'>ci.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/ci.scm?id=4107a56e73776c6c3d51c49f54c9a2ae96fdcd1e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-03-13 17:33:38 +0100'>2020-03-13</span></td><td><a href='/guix/commit/gnu/ci.scm?id=f292c5019111f92b6850afdca4b59f4146b9be3b'>maint: Add 'etc/release-manifest.scm'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-05 23:40:24 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/ci.scm?id=bc8b2ffdac3f55414629ace5b1a0db32e9656c0a'>ci: Adjust 'channel-build-system' for when the source is a file name.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-05 16:33:37 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/ci.scm?id=dd1ee160be8ba4e211432c08e161c24901cd670e'>tests: "make check-system" no longer interns source upfront.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-05 16:33:37 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/ci.scm?id=3046e73b4c773a43ffa9ea583c0b469aaa8c5256'>ci: Move 'cross-jobs' procedure to the top level.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-31 17:06:16 +0100'>2020-01-31</span></td><td><a href='/guix/commit/gnu/ci.scm?id=2032d8473d11711b88fd3e48644c569dee32fa42'>ci: Cross-build for riscv64-linux-gnu.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-12-01 11:26:11 +0100'>2019-12-01</span></td><td><a href='/guix/commit/gnu/ci.scm?id=f71b0a0012d46bd30ead1a14ed58fd59647415e2'>ci: Make sure the Guix checkout is the one providing Cuirass proc.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2019-11-13 23:26:35 +0100'>2019-11-13</span></td><td><a href='/guix/commit/gnu/ci.scm?id=887fd835a7c90f720d36a211478012547feaead0'>tests: "make check-system" uses Guix built with (guix self).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-08-26 13:40:46 +0200'>2019-08-26</span></td><td><a href='/guix/commit/gnu/ci.scm?id=f00ff8db9253b077ea625072d41f573cd1f73f3d'>ci: Try hard to build package replacements.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-08-14 21:29:53 +0200'>2019-08-14</span></td><td><a href='/guix/commit/gnu/ci.scm?id=67dac6b8920755cb011047157bb7b4fae4760143'>gnu: mingw: Add x86_64 support.</a><span class='msg-avail'>...</span></td><td>Carl Dong</td></tr>
<tr><td><span title='2019-07-06 16:17:24 +0200'>2019-07-06</span></td><td><a href='/guix/commit/gnu/ci.scm?id=c3ab921eed2a471022e9863a94ea521508782e53'>ci: 'channel-build-system' honors the target system.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>