Allow Rust-language related assets to be disabled with --disable-rust.

src/pow.cpp

@@ -5,8 +5,6 @@
 
 #include "pow.h"
 
-#include "librustzcash.h"
-
 #include "arith_uint256.h"
 #include "chain.h"
 #include "chainparams.h"
@@ -18,6 +16,10 @@
 
 #include "sodium.h"
 
+#ifdef ENABLE_RUST
+#include "librustzcash.h"
+#endif // ENABLE_RUST
+
 unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
 {
     unsigned int nProofOfWorkLimit = UintToArith256(params.powLimit).GetCompact();
@@ -98,11 +100,13 @@ bool CheckEquihashSolution(const CBlockHeader *pblock, const CChainParams& param
     // H(I||V||...
     crypto_generichash_blake2b_update(&state, (unsigned char*)&ss[0], ss.size());
 
+    #ifdef ENABLE_RUST
     // Ensure that our Rust interactions are working in production builds. This is
     // temporary and should be removed.
     {
         assert(librustzcash_xor(0x0f0f0f0f0f0f0f0f, 0x1111111111111111) == 0x1e1e1e1e1e1e1e1e);
     }
+    #endif // ENABLE_RUST
 
     bool isValid;
     EhIsValidSolution(n, k, state, pblock->nSolution, isValid);