[PATCH] Correct misspelled "XDS" to "XDG" in Support/Unix/Path.inc

[Robert Ma via llvm-commits]

Hello LLVM developers,

According to the XDG spec
(https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html),
the environment variable for the user cache directory should be
$XDG_CACHE_HOME instead of $XDS_CACHE_HOME. I believe the several
appearances of "XDS" in lib/Support/Unix/Path.inc was a typo.

In the attached patch, I changed all the misspelled XDS/Xds to the
correct XDG/Xdg, including the environment variable, a local variable
name, and comments.

Thank you.


Regards,
Robert Ma
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