Issue title: equihash.so migrato from libsodium to use same blake2b function in modCrypto
 Issue body: This change will help clean up the unnecessary dependency in :
https://github.com/aionnetwork/aion/tree/dev/native/linux/sodium/sodium
by replace blake2b function from libsodium to libblake2b.
 Comments: 
 Comment 0: Done.
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