Remove old nogil classes creation code

Cython/Compiler/ModuleNode.py

@@ -1124,7 +1124,6 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
             self.sue_header_footer(type, "struct", type.objstruct_cname)
         code.putln(header)
         base_type = type.base_type
-        nogil = type.nogil
         if base_type:
             basestruct_cname = base_type.objstruct_cname
             if basestruct_cname == "PyTypeObject":
@@ -1135,16 +1134,6 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
                     ("struct ", "")[base_type.typedef_flag],
                     basestruct_cname,
                     Naming.obj_base_cname))
-        elif nogil:
-            # Extension type with nogil keyword indicate it is a CPython-free struct
-            code.globalstate.use_utility_code(
-                UtilityCode.load_cached("CythonReferenceCounting", "ObjectHandling.c"))
-            code.putln(
-                "// nogil"
-            )
-            code.putln(
-                "CyObject_HEAD"
-            )
         else:
             code.putln(
                 "PyObject_HEAD")