Replace memcmp with std::equal in CScript::FindAndDelete

Function is stl; std::equal just makes more sense.

src/script/script.h

@@ -574,7 +574,7 @@ public:
         opcodetype opcode;
         do
         {
-            while (end() - pc >= (long)b.size() && memcmp(&pc[0], &b[0], b.size()) == 0)
+            while (end() - pc >= (long)b.size() && std::equal(b.begin(), b.end(), pc))
             {
                 pc = erase(pc, pc + b.size());
                 ++nFound;