[patch] fixes lilypond-book on OSX with python 2.4.4

[Graham Percival]

I had to apply the attached patch to get lilypond-book from GUB
2.11.43-2 to work on OSX with python 2.4.4.  The line numbers probably
won't match up exactly with the version in git, since they were based
on the "compiled" lilypond-book script.

According to a "python set example" webpage, Set() is capitalized.
Maybe in 2.5 it accepts the lower case version?  (I don't pretend to
understand why I need this patch any (presumably) Han-Wen didn't; I'll
let you python guys sort it out from here.  :)

Cheers,
- Graham

lilypond-book.patch
Description: Binary data