Exit if a proper message instead of segfault on Android without management

Exit if a proper message instead of segfault on Android without management

The Android implementation is relying on the management interface to be
always available. Trying to run the Android binary without the mangament
interface outside the app leads to a segfault. Exit with a FATAL error
instead.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20230220131424.1749736-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26288.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>