Update font config to match freedesktop-sdk

This is necessary for custom user fonts to work.

50-flatpak.conf

@@ -1,3 +1,6 @@
+<!-- This should be kept in sync with changes to
+     https://gitlab.com/freedesktop-sdk/freedesktop-sdk/blob/master/files/fontconfig-flatpak.conf
+     from the Freedesktop runtimes. -->
 <?xml version="1.0"?>
 <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
 <fontconfig>
@@ -9,4 +12,13 @@
         <include ignore_missing="yes">/app/etc/fonts/local.conf</include>
 
         <dir>/run/host/fonts</dir>
+        <dir>/run/host/user-fonts</dir>
+
+        <!-- This is duplicated from the general config because we want to write there
+             before the /run dirs, in case they are ever writable, like e.g with old
+             versions of flatpak. -->
+        <cachedir prefix="xdg">fontconfig</cachedir>
+
+        <cachedir>/run/host/fonts-cache</cachedir>
+        <cachedir>/run/host/user-fonts-cache</cachedir>
 </fontconfig>

flatpak-runtime-config.spec

@@ -1,6 +1,6 @@
 Name:           flatpak-runtime-config
-Version:        29
-Release:        6%{?dist}
+Version:        30
+Release:        1%{?dist}
 Summary:        Configuration files that live inside the flatpak runtime
 Source1:        50-flatpak.conf
 Source2:        usercustomize.py
@@ -70,6 +70,9 @@ HOME=/root /usr/bin/fc-cache -s
 %{_sysconfdir}/ld.so.conf.d/app.conf
 
 %changelog
+* Fri Jul 26 2019 Mark Otaris <mark@net-c.com> - 30-1
+- Update font config to match freedesktop-sdk, allowing user-installed fonts to work
+
 * Thu Jul 25 2019 Fedora Release Engineering <releng@fedoraproject.org> - 29-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild