[tests] update test case for generalized check

tests/spec/generalized_check.i

+/* run.config
+OPT: -wp -wp-prover qed -wp-msg-key no-time-info -print
+*/
 /*@ check lemma tauto: \true ==> \true; */
 
 /*@ check requires \valid(x);

tests/spec/oracle/generalized_check.res.oracle

 [kernel] Parsing tests/spec/generalized_check.i (no preprocessing)
+[wp] Running WP plugin...
+[wp] Warning: Missing RTE guards
+[wp] 6 goals scheduled
+[wp] [Qed] Goal typed_f_assigns : Valid
+[wp] [Qed] Goal typed_f_check : Valid
+[wp] [Qed] Goal typed_f_ensures : Valid
+[wp] [Qed] Goal typed_lemma_tauto : Valid
+[wp] [Qed] Goal typed_main_call_f_requires : Valid
+[wp] [Failed] Goal typed_main_check
+[wp] Proved goals:    5 / 6
+  Qed:             5
 /* Generated by Frama-C */
 /*@ check lemma tauto: \true;
  */