[vcpkg] Use XDG/LOCALAPPDATA for default binary caching path #12091
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For binary caching, we should follow the XDG base directory specification[1] on non-Windows platforms. This means we should use
~/.cache/vcpkg/archives
as the default package storage location instead of~/.vcpkg/archives
.On Windows, the appropriate per-user base directory is
%LOCALAPPDATA%
, so we will use%LOCALAPPATA%/vcpkg/archives
.[1] https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html