lilypond-book.py can hang on Windows 10; I know why; I need help to fix it

[Daniel Connors]

A simple fix is to add these two lines of code to book_latex.py just before
the temporary file is created, just after line 205:

if(sys.platform == 'win32'):
        tempfile.tempdir = 'C:/Temp'

If lilypond-book.py is running on a Windows platform, create the
temporary file in C:/Temp.  Then we don't have to worry about the
length of the user_id and this getting mangled with a '~'.

Dan