No implementation of get_current_sc_object according to spec

[silabs-MattG]

The SystemC LRM v 1666-2023 defines a global function sc_object * sc_core::get_current_sc_object();

Later on in the spec, it erroneously calls this function a "member function".

Ignoring this specification error, there doesn't seem to be an implementation of either a member function or a global function get_current_sc_object() in this library.

[lmailletcontoz]

Looks like an LRM issue, to be reviewed and fixed by the IEEE team. Thanks for spotting this.