lang: codegen: remove old var declaration generator

lang/codegen/var.c

@@ -5,6 +5,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#if 0
+
 struct var_codegen_state {
 	struct code_generator_state s_base;
 	unsigned int s_prev_node;
@@ -157,7 +159,7 @@ struct code_generator var_generator = {
 	.g_value_received = value_received,
 	.g_expr_generator = gen_value_expr,
 	.g_node_generators = {
-		[IVY_AST_VAR] = gen_var,
 		[IVY_AST_IDENT] = gen_ident,
 	},
 };
+#endif