Move SHA256 class to libroot instead of linking libshared into libroot.

Discussed with PulkoMandy and on the haiku-commits mailing list.

Thanks to @jessicah for compile-testing and fixing 2 small i

Move SHA256 class to libroot instead of linking libshared into libroot.

Discussed with PulkoMandy and on the haiku-commits mailing list.

Thanks to @jessicah for compile-testing and fixing 2 small issues I missed.

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