[libcxx] Fix inverted has_terminal condition

Summary:
This used to indicate "has no terminal" and now it indicates "has
terminal" but the check was not changed.

Author: jhuber6

libcxx/include/print

@@ -199,7 +199,7 @@ _LIBCPP_HIDE_FROM_ABI inline bool __is_terminal([[maybe_unused]] FILE* __stream)
   // the behavior in the test. This is not part of the public API.
 #  ifdef _LIBCPP_TESTING_PRINT_IS_TERMINAL
   return _LIBCPP_TESTING_PRINT_IS_TERMINAL(__stream);
-#  elif _LIBCPP_AVAILABILITY_HAS_PRINT == 0 || _LIBCPP_HAS_TERMINAL
+#  elif _LIBCPP_AVAILABILITY_HAS_PRINT == 0 || !_LIBCPP_HAS_TERMINAL
   return false;
 #  elif defined(_LIBCPP_WIN32API)
   return std::__is_windows_terminal(__stream);