uses default value when $XDG-CONFIG-HOME is missing #50
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In the real world, there are many systems that do not set
XDG-CONFIG-HOME
variable, and fontconfig will follow the XDG spec, use a default value of$HOME/.config
.This PR emulates it's behavior. And will fallback to loading the global config file
/etc/fonts/local.conf
if parse user's config failed(e.g. file not exist).