Convert compression.h to new serialization framework

src/txdb.cpp

@@ -336,7 +336,7 @@ public:
         vout.assign(vAvail.size(), CTxOut());
         for (unsigned int i = 0; i < vAvail.size(); i++) {
             if (vAvail[i])
-                ::Unserialize(s, CTxOutCompressor(vout[i]));
+                ::Unserialize(s, Using<TxOutCompression>(vout[i]));
         }
         // coinbase height
         ::Unserialize(s, VARINT(nHeight, VarIntMode::NONNEGATIVE_SIGNED));