Introduce librustzcash and Rust to depends system.

src/pow.cpp

@@ -5,6 +5,8 @@
 
 #include "pow.h"
 
+#include "librustzcash.h"
+
 #include "arith_uint256.h"
 #include "chain.h"
 #include "chainparams.h"
@@ -96,6 +98,12 @@ bool CheckEquihashSolution(const CBlockHeader *pblock, const CChainParams& param
     // H(I||V||...
     crypto_generichash_blake2b_update(&state, (unsigned char*)&ss[0], ss.size());
 
+    // Ensure that our Rust interactions are working in production builds. This is
+    // temporary and should be removed.
+    {
+        assert(librustzcash_xor(0x0f0f0f0f0f0f0f0f, 0x1111111111111111) == 0x1e1e1e1e1e1e1e1e);
+    }
+
     bool isValid;
     EhIsValidSolution(n, k, state, pblock->nSolution, isValid);
     if (!isValid)