Revert "Allow user to ask server to save the Sprout R1CS out during startup."

This reverts commit 685c0ab07f.

src/init.cpp

@@ -844,8 +844,6 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
             return InitError(_("Payment disclosure requires -experimentalfeatures."));
         } else if (mapArgs.count("-zmergetoaddress")) {
             return InitError(_("RPC method z_mergetoaddress requires -experimentalfeatures."));
-        } else if (mapArgs.count("-savesproutr1cs")) {
-            return InitError(_("Saving the Sprout R1CS requires -experimentalfeatures."));
         } else if (mapArgs.count("-insightexplorer")) {
             return InitError(_("Insight explorer requires -experimentalfeatures."));
         }
@@ -1238,14 +1236,6 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
     // Initialize Zcash circuit parameters
     ZC_LoadParams(chainparams);
 
-    if (GetBoolArg("-savesproutr1cs", false)) {
-        boost::filesystem::path r1cs_path = ZC_GetParamsDir() / "r1cs";
-
-        LogPrintf("Saving Sprout R1CS to %s\n", r1cs_path.string());
-
-        pzcashParams->saveR1CS(r1cs_path.string());
-    }
-
     /* Start the RPC server already.  It will be started in "warmup" mode
      * and not really process calls already (but it will signify connections
      * that the server is there and will be ready later).  Warmup mode will

src/zcash/JoinSplit.cpp

@@ -101,16 +101,6 @@ public:
         saveToFile(pkPath, keypair.pk);
     }
 
-    void saveR1CS(std::string path)
-    {
-        protoboard<FieldT> pb;
-        joinsplit_gadget<FieldT, NumInputs, NumOutputs> g(pb);
-        g.generate_r1cs_constraints();
-        r1cs_constraint_system<FieldT> r1cs = pb.get_constraint_system();
-
-        saveToFile(path, r1cs);
-    }
-
     bool verify(
         const PHGRProof& proof,
         ProofVerifier& verifier,

src/zcash/JoinSplit.hpp

@@ -67,8 +67,6 @@ public:
                          const uint256& joinSplitPubKey
                         );
 
-    virtual void saveR1CS(std::string path) = 0;
-
     // Compute nullifiers, macs, note commitments & encryptions, and SNARK proof
     virtual SproutProof prove(
         bool makeGrothProof,