Merged update from upstream sources

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Source: https://src.fedoraproject.org/rpms/poppler.git#ff7d7e389deec9366a19743a49cba5bca4907a43

poppler.spec

@@ -4,7 +4,7 @@
 Summary: PDF rendering library
 Name:    poppler
 Version: 21.01.0
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: (GPLv2 or GPLv3) and GPLv2+ and LGPLv2+ and MIT
 URL:     http://poppler.freedesktop.org/
 Source0: http://poppler.freedesktop.org/poppler-%{version}.tar.xz
@@ -214,6 +214,9 @@ test "$(pkg-config --modversion poppler-qt5)" = "%{version}"
 %{_mandir}/man1/*
 
 %changelog
+* Tue Mar 30 2021 Jonathan Wakely <jwakely@redhat.com> - 21.01.0-6
+- Rebuilt for removed libstdc++ symbol (#1937698)
+
 * Tue Feb 9 2021 Marek Kasik <mkasik@redhat.com> - 21.01.0-5
 - Obsolete Qt4 frontend
 - Resolves: #1926010