rm sync-extensions.sh

The file is an unmaintained ancient relic which is no longer usable
in the project. dpdefs require manual syncing at the time of a release
and we do not use the sources mentioned in the file for them but
copy them from the DP engine we ship.

diff --git a/sync-extensions.sh b/sync-extensions.sh
deleted file mode 100755 (executable)
index 833a435..0000000
--- a/sync-extensions.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/sh
-
-wget -N http://svn.icculus.org/*checkout*/twilight/trunk/dpmod/qc/dpextensions.qc
-wget -N http://svn.icculus.org/*checkout*/nexuiz/trunk/data/qcsrc/server/extensions.qh
-vimdiff dpextensions.qc extensions.qh qcsrc/server/extensions.qh