symlink just /etc/ssl/certs/ca-certificates.crt

symlink just /etc/ssl/certs/ca-certificates.crt

Restrictive permissions to PLD /etc/certs break gajim when symlinked to
/etc/ssl/certs:

> 2019-01-13 13:27:08 (E) nbxmpp.tls_nb PlugIn: while trying _startSSL():
> Traceback (most recent call last):
>   File "/usr/share/python3.7/site-packages/nbxmpp/tls_nb.py", line 288, in plugin
>     res = self._startSSL()
>   File "/usr/share/python3.7/site-packages/nbxmpp/tls_nb.py", line 327, in _startSSL
>     result = self._startSSL_pyOpenSSL()
>   File "/usr/share/python3.7/site-packages/nbxmpp/tls_nb.py", line 451, in _startSSL_pyOpenSSL
>     for f in os.listdir('/etc/ssl/certs'):
> PermissionError: [Errno 13] Permission denied: '/etc/ssl/certs'

Release: 4