glibc: changed to explicitely use tar --dereference while extracting glibc-ports (see note)

Note:

Starting with tar 1.24 we have to use tar --dereference so the formerly
created symlink won't be removed.

base/glibc/glibc.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../glibc/glibc.conf
-# Copyright (C) 2006 - 2010 The OpenSDE Project
+# Copyright (C) 2006 - 2011 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 #
 # More information can be found in the files COPYING and README.
@@ -106,7 +106,7 @@ glibc_prepatch() {
 		# extract each addon into the definitive folder
 		mkdir -pv $addon
 		ln -sv $addon $tarname
-		tar -v ${taropt} $tarball
+		tar -v --dereference ${taropt} $tarball
 		rm $tarname
 	done