[ipvsadm2] Improved the way we enable the availability of 'ip_vs.h' header

Instead of simply copying the 'ip_vs.h' header file we apply a patch that
assures the installation of a 'sanitized' version while building the
linux-header package.

network/ipvsadm2/linux-header-install-ip_vs.h.diff

@@ -0,0 +1,37 @@
+# --- SDE-COPYRIGHT-NOTE-BEGIN ---
+# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
+#
+# Filename: package/.../ipvsadm2/linux-header-install-ip_vs.h.diff
+# Copyright (C) 2008 The OpenSDE Project
+#
+# More information can be found in the files COPYING and README.
+#
+# This patch file is dual-licensed. It is available under the license the
+# patched project is licensed under, as long as it is an OpenSource license
+# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
+# of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+# --- SDE-COPYRIGHT-NOTE-END ---
+
+Author: Christian Wiese <morfoh@opensde.org>
+Origin: OpenSDE (http://opensde.org)
+Description: Install a 'sanitized' version of the ip_vs.h header file
+             to satisfy ipvsadm2 and keepalived.
+
+diff -ruN linux-2.6.22.orig/include/Kbuild linux-2.6.22/include/Kbuild
+--- linux-2.6.22.orig/include/Kbuild	2007-07-09 02:32:17.000000000 +0300
++++ linux-2.6.22/include/Kbuild	2008-03-13 20:33:16.000000000 +0200
+@@ -3,6 +3,7 @@
+ header-y += scsi/
+ header-y += sound/
+ header-y += mtd/
++header-y += net/
+ header-y += rdma/
+ header-y += video/
+ 
+diff -ruN linux-2.6.22.orig/include/net/Kbuild linux-2.6.22/include/net/Kbuild
+--- linux-2.6.22.orig/include/net/Kbuild	1970-01-01 02:00:00.000000000 +0200
++++ linux-2.6.22/include/net/Kbuild	2008-03-13 20:35:34.000000000 +0200
+@@ -0,0 +1 @@
++unifdef-y += ip_vs.h

network/ipvsadm2/pkg_linux-header_pre.conf

@@ -2,6 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../ipvsadm2/pkg_linux-header_pre.conf
+# 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.
@@ -11,6 +12,9 @@
 # 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 ---
+
+pkg_ipvsadm2_confdir=$base/package/*/ipvsadm2
+
 if ! atstage toolchain; then
-	hook_add postmake 5 'cp -v include/net/ip_vs.h $root/usr/include/net/'
+	var_append patchfiles ' ' "$pkg_ipvsadm2_confdir/linux-header-install-ip_vs.h.diff"
 fi