Use /usr/bin/python3 explicitly

https://fedoraproject.org/wiki/FinalizingFedoraSwitchtoPython3#Transition_Steps

Resolves: #1605490

poppler-0.63.0-python3.patch

@@ -0,0 +1,8 @@
+--- poppler-0.63.0/make-glib-api-docs
++++ poppler-0.63.0/make-glib-api-docs
+@@ -1,4 +1,4 @@
+-#!/usr/bin/env python
++#!/usr/bin/python3
+ #
+ # Copyright (C) 2017 Carlos Garcia Campos <carlosgc@gnome.org>
+ #

poppler.spec

@@ -4,7 +4,7 @@
 Summary: PDF rendering library
 Name:    poppler
 Version: 0.63.0
-Release: 3%{?dist}
+Release: 4%{?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
@@ -18,6 +18,8 @@ Patch1:  0001-Revert-Remove-the-Qt4-frontend.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=1578780
 Patch3:  CVE-2017-18267.patch
 
+Patch4:  poppler-0.63.0-python3.patch
+
 BuildRequires: cmake
 BuildRequires: gcc-c++
 BuildRequires: gettext-devel
@@ -248,6 +250,11 @@ test "$(pkg-config --modversion poppler-splash)" = "%{version}"
 %{_mandir}/man1/*
 
 %changelog
+* Mon Jul 23 2018 Marek Kasik <mkasik@redhat.com> - 0.63.0-4
+- Use /usr/bin/python3 explicitly
+- https://fedoraproject.org/wiki/FinalizingFedoraSwitchtoPython3#Transition_Steps
+- Resolves: #1605490
+
 * Fri Jul 13 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.63.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild