Remove conditional text for Apache2 linking exception

With the reimplementation of the tls-export feature and removal/approval
or being trivial of the rest of the code, now all the code falls under
new license. Remove the conditional text of the license to be only valid
for parts of OpenVPN.

Change-Id: Ia9c5453dc08679ffb73a275ddd4f28095ff1c1f8
Acked-by: dazo <[email protected]>
Message-Id: <[email protected]>
URL: https://www.mail-archive.com/[email protected]/msg28077.html
Signed-off-by: Gert Doering <[email protected]>
(cherry picked from commit 275aa89)

COPYING

@@ -33,11 +33,6 @@ OpenVPN license:
 
 Apache2 linking exception:
 ---------------------------
-OpenVPN is currently undergoing a license change to add an exception for
-Apache 2 linking. The following exception is only valid for new contributions
-after 2023-05-03 and past contribution where the authors have already agreed
-to the exception.
-
   In addition, as a special exception, OpenVPN Inc and the
   contributors give permission to link the code of this program to
   libraries (the "Libraries") licensed under the Apache License