The appended patch

From: Ian Romanick <idr@us.ibm.com>
Date: Thu, 13 Jul 2006 15:27:37 +0000
Subject: [PATCH] Move initialization of server_support from
__glXProcessServerString to __glXCalcualteUsableExtensions.

should solve the problem. I adjusted the file path to make it applicable
to x2go.

Cf.
https://bugs.freedesktop.org/show_bug.cgi?id=7353

The patch dates from *** 2006 ***. We definitely should rebase the mesa
code.

Best regards

Heinrich Schuchardt