is_legal: fix check+pinned and knight check; perft-test + perft2()

test/movegen-test.c

@@ -238,7 +238,10 @@ int main(int __unused ac, __unused char**av)
         /* print movelists */
         send_stockfish_fen(outfd, fishpos, &fishmoves, fen);
         pos_gen_pseudomoves(pos, &pseudo);
+        //moves_print(&pseudo, 0);
         pos_all_legal(pos, &pseudo, &legal);
+
+        //moves_print(&legal, 0);
         //printf("Fu ");
         //moves_print(fishpos, 0);
         //fflush(stdout);