fix(core): make Guid entropy chunking portable to i686 #454

Job	Run time
Full compatibility build	12m 26s
Doxygen warning baseline	49s
Security.Cryptography.Random	31s
Text.Json	1m 40s
IO.Compression	51s
Net.WebSockets	1m 11s
Xml.Linq	1m 14s
Core.Base	3m 54s
IO.IsolatedStorage	40s
IO.Compression.Zip	44s
Net.Http.Headers	1m 27s
	25m 27s

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