Automatically populating $HTTP_RAW_POST_DATA is deprecated

I just set up 12.03 on a shared host environment with PHP 5.6.31, and the log is filling with these messages admonishing me to set always_populate_raw_post_data=-1 in php.ini. While I can’t do that, I can create .user.ini in the nextcloud root and set it there. But wait–the nextcloud installation process already did it. I can verify that it is set with phpinfo(). But the messages keep coming. Advice?