graphics/pdf2dvju: fix for new poppler

Hi,

this fixes the build with poppler-0.86.*

ok? (noe, we really don't need a REVISION bump here)

Ciao,
Kili

Index: patches/patch-pdf2djvu_cc
===================================================================
RCS file: patches/patch-pdf2djvu_cc
diff -N patches/patch-pdf2djvu_cc
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ patches/patch-pdf2djvu_cc 8 Mar 2020 21:03:09 -0000
@@ -0,0 +1,54 @@
+$OpenBSD$
+
+From upstream version 0.9.17.
+
+Index: pdf2djvu.cc
+--- pdf2djvu.cc.orig
++++ pdf2djvu.cc
+@@ -81,7 +81,11 @@ static int get_page_for_goto_link(pdf::link::GoTo *got
+