Added "why is make installed sgid kmem" TODO

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@144 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

TODO

@@ -1,5 +1,7 @@
 These are the TODO items for the next LFS release (3.0):
 
+* Find out why exactly make is installed sgid kmem
+
 * chapter6/chroot.sgml - "Make sure you execute all the following
   commands in this chapter" -> "Make sure you execute all the following
   commands in this and the remaining chapters"