[tests] add extra check related to logic preprocessing

tests/jcdb/logic-pp-include/no-stdio.c

 // compile_commands.json must have "-includestdio.h" and define ZERO
+
+//@ ensures \result == ZERO;
 int main(){
   printf("bla\n");
   return ZERO;

tests/jcdb/oracle/logic-pp-include.res

@@ -4,6 +4,7 @@
 #include "stdarg.h"
 #include "stddef.h"
 #include "stdio.h"
+/*@ ensures \result ≡ 0; */
 int main(void)
 {
   int __retres;