drake: Remove redundant cast(T&&) overloads

They cause errors otherwise

Author: EricCousineau-TRI

include/pybind11/cast.h

@@ -2028,26 +2028,6 @@ object cast(T &&value, return_value_policy policy = return_value_policy::automat
 template <typename T> T handle::cast() const { return pybind11::cast<T>(*this); }
 template <> inline void handle::cast() const { return; }
 
-template <typename T>
-detail::enable_if_t<
-        // TODO(eric.cousineau): Figure out how to prevent perfect-forwarding more elegantly.
-        std::is_rvalue_reference<T&&>::value && !detail::is_pyobject<detail::intrinsic_t<T>>::value, object>
-    move(T&& value) {
-    // TODO(eric.cousineau): Add policies, parent, etc.
-    // It'd be nice to supply a parent, but for now, just leave it as-is.
-    handle no_parent;
-    return reinterpret_steal<object>(
-        detail::make_caster<T>::cast(std::move(value), return_value_policy::take_ownership, no_parent));
-}
-
-template <typename T>
-detail::enable_if_t<
-        std::is_rvalue_reference<T&&>::value && !std::is_pointer<T>::value && !detail::is_pyobject<detail::intrinsic_t<T>>::value, object>
-    cast(T&& value) {
-    // Have to use `pybind11::move` because some compilers might try to bind `move` to `std::move`...
-    return pybind11::move<T>(std::move(value));
-}
-
 template <typename T>
 detail::enable_if_t<!detail::move_never<T>::value, T> move(object &&obj) {
     if (obj.ref_count() > 1)