Revert "the deprecation will need to wait until codebase is clean"

This reverts commit bba17d9.

The concerns of that commit should be addressed by
disabling the warnings by default

Author: hannes-steffenhagen-diffblue

src/util/arith_tools.h

@@ -23,12 +23,12 @@ class typet;
 // this one will go away
 // returns 'true' on error
 /// \deprecated: use the constant_exprt version instead
-//DEPRECATED("Use the constant_exprt version instead")
+DEPRECATED("Use the constant_exprt version instead")
 bool to_integer(const exprt &expr, mp_integer &int_value);
 
 // returns 'true' on error
 /// \deprecated: use numeric_cast<mp_integer> instead
-//DEPRECATED("Use numeric_cast<mp_integer> instead")
+DEPRECATED("Use numeric_cast<mp_integer> instead")
 bool to_integer(const constant_exprt &expr, mp_integer &int_value);
 
 // returns 'true' on error

src/util/mp_arith.h

@@ -53,15 +53,15 @@ const std::string integer2binary(const mp_integer &, std::size_t width);
 const mp_integer binary2integer(const std::string &, bool is_signed);
 
 /// \deprecated use numeric_cast<unsigned long long> instead
-//DEPRECATED("Use numeric_cast<unsigned long long> instead")
+DEPRECATED("Use numeric_cast<unsigned long long> instead")
 mp_integer::ullong_t integer2ulong(const mp_integer &);
 
 /// \deprecated use numeric_cast<std::size_t> instead
-//DEPRECATED("Use numeric_cast<std::size_t> instead")
+DEPRECATED("Use numeric_cast<std::size_t> instead")
 std::size_t integer2size_t(const mp_integer &);
 
 /// \deprecated use numeric_cast<unsigned> instead
-//DEPRECATED("Use numeric_cast<unsigned> instead")
+DEPRECATED("Use numeric_cast<unsigned> instead")
 unsigned integer2unsigned(const mp_integer &);
 
 const mp_integer mp_zero=string2integer("0");