Move void_list_node init to common code

Move void_list_node init to common code

All frontends replicate this, so move it.

gcc/
	* tree.cc (build_common_tree_nodes): Initialize void_list_node
	here.

gcc/ada/
	* gcc-interface/trans.cc (gigi): Do not initialize void_list_node.

gcc/c-family/
	* c-common.h (build_void_list_node): Remove.
	* c-common.cc (c_common_nodes_and_builtins): Do not initialize
	void_list_node.

gcc/c/
	* c-decl.cc (build_void_list_node): Remove.

gcc/cp/
	* decl.cc (cxx_init_decl_processing): Inline last
	build_void_list_node call.
	(build_void_list_node): Remove.

gcc/d/
	* d-builtins.cc (d_build_c_type_nodes): Do not initialize
	void_list_node.

gcc/fortran/
	* f95-lang.cc (gfc_init_decl_processing): Do not initialize
	void_list_node.

gcc/go/
	* go-lang.cc (go_langhook_init): Do not initialize
	void_list_node.

gcc/jit/
	* dummy-frontend.cc (jit_langhook_init): Do not initialize
	void_list_node.

gcc/lto/
	* lto-lang.cc (lto_build_c_type_nodes): Do not initialize
	void_list_node.