Auto merge of #3098 - str4d:2343-overwinter-disable-mempooltxinputlimit, r=str4d

Ignore -mempooltxinputlimit once Overwinter activates

Overwinter changes the SignatureHash function to solve the quadratic hashing problem, so this option will no longer be needed.

src/main.cpp

@@ -1169,6 +1169,9 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
     // Node operator can choose to reject tx by number of transparent inputs
     static_assert(std::numeric_limits<size_t>::max() >= std::numeric_limits<int64_t>::max(), "size_t too small");
     size_t limit = (size_t) GetArg("-mempooltxinputlimit", 0);
+    if (NetworkUpgradeActive(nextBlockHeight, Params().GetConsensus(), Consensus::UPGRADE_OVERWINTER)) {
+        limit = 0;
+    }
     if (limit > 0) {
         size_t n = tx.vin.size();
         if (n > limit) {