Update a stubbed type for RJIT

cfunc.func is actually used by RJIT

rjit_c.rb

@@ -1004,6 +1004,10 @@ module RubyVM::RJIT # :nodoc: all
     )
   end
 
+  def C.rb_cfunc_t
+    @rb_cfunc_t ||= self.VALUE
+  end
+
   def C.rb_control_frame_t
     @rb_control_frame_t ||= CType::Struct.new(
       "rb_control_frame_struct", Primitive.cexpr!("SIZEOF(struct rb_control_frame_struct)"),
@@ -1594,10 +1598,6 @@ module RubyVM::RJIT # :nodoc: all
     CType::Stub.new(:rb_event_flag_t)
   end
 
-  def C.rb_cfunc_t
-    CType::Stub.new(:rb_cfunc_t)
-  end
-
   def C.rb_method_alias_t
     CType::Stub.new(:rb_method_alias_t)
   end

tool/rjit/bindgen.rb

@@ -602,6 +602,7 @@ generator = BindingGenerator.new(
     rb_callcache
     rb_callinfo
     rb_captured_block
+    rb_cfunc_t
     rb_control_frame_t
     rb_cref_t
     rb_execution_context_struct