patch 9.0.0557: valgrind reports possibly leaked memory

Problem:    Valgrind reports possibly leaked memory.
Solution:   Move the problematic test function to the "fails" test file to
            avoid obscuring real memory leaks.

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    557,
 /**/
     556,
 /**/