Add test for __anonCompField parsing

tests/syntax/oracle/rename.res.oracle

 [kernel] Parsing tests/syntax/rename.i (no preprocessing)
 /* Generated by Frama-C */
+struct not_anon {
+   int __anonCompField1 ;
+};
 int f(void)
 {
   int x = 0;
@@ -62,4 +65,5 @@ void f4(int *j_0_1)
   return;
 }
 
+struct not_anon s = {.__anonCompField1 = 0};
 

tests/syntax/rename.i

@@ -38,3 +38,9 @@ void f4(int *j_0_1) {
   { int j_0_1 = j_0;
     j_0_1+=j_0; }
 }
+
+struct not_anon {
+    int __anonCompField1;
+};
+
+struct not_anon s = {.__anonCompField1 = 0};