Reduce build warnings and enable Qt build

src/script/script.h

@@ -377,6 +377,7 @@ protected:
 public:
     CScript() { }
     CScript(const CScript& b) : std::vector<unsigned char>(b.begin(), b.end()) { }
+    CScript& operator=(const CScript& b) = default;
     CScript(const_iterator pbegin, const_iterator pend) : std::vector<unsigned char>(pbegin, pend) { }
     CScript(const unsigned char* pbegin, const unsigned char* pend) : std::vector<unsigned char>(pbegin, pend) { }
 

src/script/standard.cpp

@@ -85,7 +85,7 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
 
     // Scan templates
     const CScript& script1 = scriptPubKey;
-    for (const PAIRTYPE(txnouttype, CScript)& tplate : mTemplates)
+    for (const auto& tplate : mTemplates)
     {
         const CScript& script2 = tplate.second;
         vSolutionsRet.clear();