gcc: remove alpha architecture support

This architecture is not maintained in OpenSDE and has itself no real
relevance anymore.

base/gcc/arch/options.alpha.in

@@ -1,19 +0,0 @@
-# --- SDE-COPYRIGHT-NOTE-BEGIN ---
-# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
-#
-# Filename: package/.../gcc/arch/options.alpha.in
-# Copyright (C) 2008 The OpenSDE Project
-# Copyright (C) 2004 - 2006 The T2 SDE Project
-#
-# More information can be found in the files COPYING and README.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License. A copy of the
-# GNU General Public License can be found in the file COPYING.
-# --- SDE-COPYRIGHT-NOTE-END ---
-
-if [ $SDECFG_ALPHA_OPT != generic ] ; then
-	var_append GCC3_WRAPPER_INSERT " " \
-		"-mtune=$SDECFG_ALPHA_OPT"
-fi