Re: [GSoC][PATCH v2 1/2] path.c: add xdg_cache_home

Devin Lehmacher [off-list ref] writes:

We already have xdg_config_home to format paths relative to
XDG_CONFIG_HOME. Let's provide a similar function xdg_cache_home to do
the same for paths relative to XDG_CACHE_HOME.

Nicely explained.

+/**
+ * Return a newly allocated string with the evaluation of
+ * "$XDG_CACHE_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise
+ * "$HOME/.config/git/$filename". Return NULL upon error.

s|CONFIG|CACHE| and s|.config|.cache| are needed, methinks.

Will fix while queuing, so no need to resend only to fix this typo.