[wp] removed arbitrary loops

src/plugins/wp/tests/wp_bts/issue_141.i

-/* run.config
-   OPT: -wp-rte -wp -wp-steps 50
-*/
-/* run.config_qualif
-   DONTRUN:
-*/
-
-typedef struct list { struct list *next; };
-struct list *cur;
-
-volatile int nondet;
-
-void f(int i) {}
-
-int main() {
-  int bla = -1;
- reset:
-  if (nondet) f(bla);
-  while (nondet) {
-    if (nondet) goto reset;
-    if (nondet) goto exit;
-  }
-  goto reset;
- exit:
-  while (nondet) {
-    cur = cur->next;
-  }
-  return 0;
-}

src/plugins/wp/tests/wp_bts/oracle/issue_141.res.oracle

-# frama-c -wp -wp-rte -wp-steps 50 [...]
-[kernel] Parsing tests/wp_bts/issue_141.i (no preprocessing)
-[wp] Running WP plugin...
-[rte] annotating function f
-[rte] annotating function main
-[wp] tests/wp_bts/issue_141.i:18: Warning: 
-  calculus failed on strategy
-  for 'main', behavior 'default!', all properties, both assigns or not because
-  unsupported strange loop(s). (abort)
-[wp] No proof obligations