target/generic: disabled qt3 for reference builds due to shared files with qt4

target/generic/pkgsel/99-reference.choice

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: target/generic/pkgsel/99-reference.choice
-# Copyright (C) 2006 - 2009 The OpenSDE Project
+# Copyright (C) 2006 - 2010 The OpenSDE Project
 #
 # More information can be found in the files COPYING and README.
 #
@@ -97,3 +97,5 @@ X cron
 O bcron
 X gcc
 O fastjar
+X qt4
+O qt3