platforms: use $XDG_DATA_HOME for cache on linux/freebsd/macos #1510
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$XDG_CACHE_HOME may be, in both specification and application, mounted on a tmpfs, removed frequently, &c. It generally appears to be used for small amounts of unimportant data, which is not what Alire expects of it. This commit switches things over to $XDG_DATA_HOME, which is generally more reliable.
Fixes #1502. (It looks discussion on that issue reached consensus; no worries if there's still debate/concern!)