libxml: fixed build with our older than 1.13 aclocal.

textproc/libxml/libxml.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../libxml/libxml.conf
-# Copyright (C) 2007 The OpenSDE Project
+# Copyright (C) 2007 - 2014 The OpenSDE Project
 #
 # More information can be found in the files COPYING and README.
 #
@@ -12,6 +12,9 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
+# Needed because Makefile wants to run aclocal-1.13
+hook_add preconf 9 'autoreconf -ivf'
+
 hook_add postmake 3 'libxml_catalog'
 libxml_catalog() {
 	local catalog=/etc/xml/catalog