* ada-lang.h (ada_convert_actual): Add GDBARCH argument.

	* ada-lang.h (ada_convert_actual): Add GDBARCH argument.
	* ada-lang.c (convert_actual): Remove stale prototype.
	(ensure_lval, make_array_descriptor, ada_convert_actual):
	Add GDBARCH argument and pass through to subroutine calls.
	(ensure_lval): Use GDBARCH instead of current_gdbarch.
	* infcall.c (value_arg_coerce): Update ada_convert_actual call.