Backport an upstream patch to fix the build

https://github.com/flatpak/flatpak/pull/1914

0001-libglnx.m4-Include-stdio.h-for-renameat2.patch

@@ -0,0 +1,29 @@
+From 7be25521cf639acc77ad8f968eb6c918533e94ec Mon Sep 17 00:00:00 2001
+From: Colin Walters <walters@verbum.org>
+Date: Wed, 11 Jul 2018 14:56:32 -0400
+Subject: [PATCH] libglnx.m4: Include stdio.h for renameat2
+
+glibc added it upstream:
+https://sourceware.org/git/?p=glibc.git;a=commit;h=d6da5cb6a8e0e8a9ce92b7d951a254cf325248d7
+
+But we need the right header.
+Ref: https://github.com/flatpak/flatpak/issues/1890
+---
+ libglnx.m4 | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/libglnx/libglnx.m4 b/libglnx.m4
+index 34caf20..5922805 100644
+--- a/libglnx/libglnx.m4
++++ b/libglnx/libglnx.m4
+@@ -7,6 +7,7 @@ AC_CHECK_DECLS([
+         [], [], [[
+ #include <sys/types.h>
+ #include <unistd.h>
++#include <stdio.h>
+ #include <sys/mount.h>
+ #include <fcntl.h>
+ #include <sched.h>
+-- 
+2.17.1
+

flatpak.spec

@@ -10,6 +10,9 @@ License:        LGPLv2+
 URL:            http://flatpak.org/
 Source0:        https://github.com/flatpak/flatpak/releases/download/%{version}/%{name}-%{version}.tar.xz
 
+# https://github.com/flatpak/flatpak/pull/1914
+Patch0:         0001-libglnx.m4-Include-stdio.h-for-renameat2.patch
+
 BuildRequires:  pkgconfig(appstream-glib)
 BuildRequires:  pkgconfig(gio-unix-2.0)
 BuildRequires:  pkgconfig(gobject-introspection-1.0) >= 1.40.0
@@ -31,6 +34,10 @@ BuildRequires:  libcap-devel
 BuildRequires:  systemd
 BuildRequires:  /usr/bin/xmlto
 BuildRequires:  /usr/bin/xsltproc
+# For patch0
+BuildRequires:  automake autoconf libtool
+BuildRequires:  gettext-devel
+BuildRequires:  gtk-doc
 
 Requires:       bubblewrap >= %{bubblewrap_version}
 Requires:       ostree-libs%{?_isa} >= %{ostree_version}
@@ -69,6 +76,9 @@ This package contains libflatpak.
 
 
 %build
+# For patch0
+autoreconf -fi
+
 (if ! test -x configure; then NOCONFIGURE=1 ./autogen.sh; CONFIGFLAGS=--enable-gtk-doc; fi;
  # User namespace support is sufficient.
  %configure --with-priv-mode=none \