updated the link to the "Recursive Make Considered Harmful" paper.

git-svn-id: http://root.cern.ch/svn/root/trunk@31530 27541ba8-7e3a-0410-8455-c3a389f83636

README/BUILDSYSTEM

@@ -135,4 +135,4 @@ Adding a new module
   third party libraries)
 
 
-[1] http://www.tip.net.au/~millerp/rmch/recu-make-cons-harm.html
+[1] http://miller.emu.id.au/pmiller/books/rmch/