lilypond-book fails (again!) under Windows

[Trevor Daniels]

Lilypond-book (2.15.39 and .40) fails under Windows while processing the 
snippet list.  LilyPond appears to be called with parameters it fails to 
recognise.  The error was introduced with commit 
38e1cad48d14f0b0f9286b4bb8891051a5f82d1e, 17 May 2012,
which added the following line to lilypond-book.py:

666     global_options.include_path.insert (0, ".%s" % os.path.sep)

Deleting this line fixes the error.  I don't know what the change was supposed 
to achieve, so I can't correct it.  Julien, can you please advise.

The symptoms are:

> Running lilypond-book
> lilypond-book.py (GNU LilyPond) 2.15.39
> Reading C:/Users/Trevor/LilyPond-git/Documentation/notation/pitches.itely...
> Running texi2pdf on file c:\users\trevor\appdata\local\temp\tmpdmutaf.texi to 
> detect default page settings.
>
> 'texi2pdf' is not recognized as an internal or external command, operable 
> program or batch file.
> lilypond-book.py: warning: Unable to auto-detect default settings:
[this is normal]
> Dissecting...
> Writing snippets...
> Processing...
> Running lilypond...
> GNU LilyPond 2.15.39
> Usage: lilypond [OPTION]... FILE...
>
>Typeset music and/or produce MIDI from FILE.
>
> LilyPond produces beautiful music notation.
> For more information, see http://lilypond.org
[delete rest of info printout]
> command failed: lilypond --formats=ps,png -dbackend=eps  -I  ".\"  -I  
> "c:\Users
> \Trevor\LilyPond-git\Documentation"  -I  
> "C:/Users/Trevor/LilyPond-git/Documenta
> tion/snippets"  -I  "C:/Users/Trevor/LilyPond-git/Documentation/snippets/new" 
>  -
> I  "C:/Users/Trevor/LilyPond-git/Documentation/included"  -I  
> "C:/Users/Trevor/L
> ilyPond-git/Documentation/pictures" --formats=eps  -deps-box-padding=3.000000 
>  -
> dread-file-list -dno-strip-output-dir  
> "C:\Users\Trevor\LilyPond-docs\pitches\ou
> t\snippet-names-726087436.ly"
> Child returned 2

Trevor