Use C++17 attribute for deprecated types

include/cantera/base/ct_defs.h

@@ -177,7 +177,7 @@ const double Tiny = 1.e-20;
  * This is used mostly to assign concentrations and mole fractions to species.
  * @deprecated To be removed after %Cantera 3.0
  */
-typedef map<string, double> compositionMap;
+typedef map<string, double> compositionMap [[deprecated("replaceable by Composition")]];
 
 //! Map from string names to doubles. Used for defining species mole/mass
 //! fractions, elemental compositions, and reaction stoichiometries.
@@ -186,10 +186,10 @@ typedef map<string, double> Composition;
 //! Turn on the use of stl vectors for the basic array type within cantera
 //! Vector of doubles.
 //! @deprecated To be removed after %Cantera 3.0
-typedef vector<double> vector_fp;
+typedef vector<double> vector_fp [[deprecated("replaceable by vector<double>")]];
 //! Vector of ints
 //! @deprecated To be removed after %Cantera 3.0
-typedef vector<int> vector_int;
+typedef vector<int> vector_int [[deprecated("replaceable by vector<int>")]];
 
 //! index returned by functions to indicate "no position"
 const size_t npos = static_cast<size_t>(-1);