run: Generate /run/host/font-dirs.xml config file

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This file lists the directories that are remapped in the sandbox,
allowing fontconfig to use the correct cache identifier for the
host-side caches.

As an example, this generates:

```
$ ./flatpak run --command=sh org.gnome.gedit
[📦 org.gnome.gedit flatpak]$ cat /run/host/font-dirs.xml
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
	<remap-dir as-path="/usr/share/fonts">/run/host/fonts</remap-dir>
	<remap-dir as-path="/home/alex/.fonts">/run/host/user-fonts</remap-dir>
</fontconfig>
```

Closes: #2635
Approved by: alexlarsson

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