auth-token: Fix compiler complaints with --disable-management

auth-token: Fix compiler complaints with --disable-management

When building with --disable-management, the compiler complains with
implicit declaration of function ‘ssl_clean_auth_token’.  This is due to
the ssl_clean_auth_token() function being declared inside an #ifdef
ENABLE_MANAGEMENT fence where it should not be.

Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20190927224536.27480-3-davids@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg18873.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>