style: prefer bool to char

* src/state.h, src/state.c (state::consistent): Make it a bool.
Adjust dependencies.

src/lalr.c

@@ -329,7 +329,7 @@ state_lookahead_tokens_count (state *s, bool default_reduction_only_for_accept)
           && default_reduction_only_for_accept))
     n_lookahead_tokens += rp->num;
   else
-    s->consistent = 1;
+    s->consistent = true;
 
   return n_lookahead_tokens;
 }