As already said 'sed' is your friend. Also I always keep my binaries eg. " lilypond-2.16.2-1.linux-x86.sh" for just such reasons. I just install in another path. And use it on files I was working on prior to the upgrade. I believe they can be found here.
http://lilypond.org/ftp/binaries/linux-x86/ anyway cheers and good luck!
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