vim-patch:9.2.0007: cindent: recognizing labels within commented lines

Problem:  Comment lines which start like a label are recognized as a
          label and indented based on that.
Solution: Check if the position is in a comment after recognizing a label
          in cin_islabel (Anttoni Erkkilä)

closes: vim/vim#19397

9af18686c7

Co-authored-by: Anttoni Erkkilä <anttoni.erkkila@protonmail.com>

test/old/testdir/test_cindent.vim

@@ -1127,6 +1127,12 @@ func Test_cindent_1()
   a();
   }
 
+  void func() {
+  /* aaaaaa
+  bbbbb:
+  ccccccc */
+  }
+
   /* end of AUTO */
   [CODE]
 
@@ -2130,6 +2136,12 @@ func Test_cindent_1()
   		a();
   }
 
+  void func() {
+  	/* aaaaaa
+  	   bbbbb:
+  	   ccccccc */
+  }
+
   /* end of AUTO */
 
   [CODE]