Fix test on OpenBSD

Index: tests/marisa-test.cc
--- tests/marisa-test.cc.orig
+++ tests/marisa-test.cc
@@ -18,7 +18,7 @@ void TestEmptyTrie() {
 #ifdef _MSC_VER
   EXCEPT(trie.write(::_fileno(stdout)), MARISA_STATE_ERROR);
 #else  // _MSC_VER
-  EXCEPT(trie.write(::fileno(stdout)), MARISA_STATE_ERROR);
+  EXCEPT(trie.write(fileno(stdout)), MARISA_STATE_ERROR);
 #endif  // _MSC_VER
   EXCEPT(std::cout << trie, MARISA_STATE_ERROR);
   EXCEPT(marisa::fwrite(stdout, trie), MARISA_STATE_ERROR);