fix custom verse breaks for windows

verses_with_chords.ly

@@ -108,7 +108,7 @@
     text
     (let make-custom-linebreaks
       ((break-words custom-verse-breaks)
-       (newtext (ly:regex-replace (ly:make-regex "\n") text " ")))
+       (newtext (ly:regex-replace (ly:make-regex "\r?\n") text " ")))
       (if (null? break-words)
           newtext
           (make-custom-linebreaks