remove redundant PULL_DEFINED() macro definition

remove redundant PULL_DEFINED() macro definition

this seems to be a leftover of the time when we had conditional
compilation for "--disable-server" or thus.  Commit d6a0cf599
removed PUSH_DEFINED() nearby but overlooked this one.

Change-Id: I9118333bb65cd5db0836abefa5d45a729f0142cc
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1322
Message-Id: <20251028203219.11737-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg33984.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>