quick fix for using LilyPond with LilyPad

[fiëé visuëlle]

Hello Developers,

I still use LilyPad, and that calls LilyPond via lilycall.py (even if  
that's probably deprecated).
In that file there's the line:

env['LILYPONDPREFIX'] = prefix + '/share/lilypond/current'

That let LilyPond fail with a deprecation warning.
Please just change it to

env['LILYPOND_DATADIR'] = prefix + '/share/lilypond/current'

and all is well.

Thank you!


Greetlings from Lake Constance
---
fiëé visuëlle
Henning Hraban Ramm
http://www.fiee.net
http://angerweit.tikon.ch/lieder/
https://www.cacert.org (I'm an assurer)