docbook ctest failing on master

[Scott Kostyshak]

The following ctest is failing for me after the recent commits:

  export/export/docbook/LilyPond_Book_docbook5

The first error in the output has to do with '&' apparently:

  Processing `./60/lily-95ee389a.ly'
  Parsing...
  ././60/lily-95ee389a.ly:7:12: error: undefined character or shorthand: &
  \relative c
             ’’ {  g a b c}

Scott
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