Gets whether the private flag of the bookmark for @uri is set.
In the event the URI cannot be found, %FALSE is returned and
@error is set to #G_BOOKMARK_FILE_ERROR_URI_NOT_FOUND. In the
event that the private flag cannot be found, %FALSE is returned and
@error is set to #G_BOOKMARK_FILE_ERROR_INVALID_VALUE.
Gets whether the private flag of the bookmark for @uri is set.
In the event the URI cannot be found, %FALSE is returned and @error is set to #G_BOOKMARK_FILE_ERROR_URI_NOT_FOUND. In the event that the private flag cannot be found, %FALSE is returned and @error is set to #G_BOOKMARK_FILE_ERROR_INVALID_VALUE.