Get rid of unused 'bool tuntap_buffer' arguments.

Get rid of unused 'bool tuntap_buffer' arguments.

overlapped_io_init() has a "bool tuntap_buffer" argument which is only
passed onwards to alloc_buf_sock_tun(), which does nothing with it.

Remove from both functions.

v2:
  move alloc_buf_sock_tun() to win32.c

v3:
  leave alloc_buf_sock_tun() where it is, and fix non-WIN32 call from
socket.c

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <20230130161730.110021-1-gert@greenie.muc.de>
URL:
https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26099.h
tml
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit bdc842d72e92995261bac3579120c94f93e4064a)
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <20230201141518.119157-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26122.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>