fix(core): honour XDG bases and SpecialFolderOption on POSIX (#2320, … #290

Job	Run time
Net.WebSockets	1m 16s
Full compatibility build	11m 28s
IO.Compression	58s
Security.Cryptography.Random	30s
Core.Base	2m 54s
Text.Json	1m 44s
Doxygen warning baseline	51s
IO.IsolatedStorage	41s
Xml.Linq	57s
Net.Http.Headers	1m 23s
IO.Compression.Zip	46s
	23m 28s

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