Remove dead symbolic links

for i in `find .`; do if (test -h $i); then file $i|grep broken; fi; done

./es/99book.bib: broken symbolic link to `../en/99book.bib'
./es/bookhtml.cfg: broken symbolic link to `../en/bookhtml.cfg'
./es/fixhtml.py: broken symbolic link to `../en/fixhtml.py'
./es/hgbook.css: broken symbolic link to `../en/hgbook.css'
./es/htlatex.book: broken symbolic link to `../en/htlatex.book'

     1.1 --- a/en/examples/extdiff	Sat May 26 11:52:18 2007 -0700
     1.2 +++ b/en/examples/extdiff	Thu May 21 14:26:31 2009 +0800
     1.3 @@ -19,6 +19,8 @@
     1.4  
     1.5  #$ name: extdiff-ctx
     1.6  
     1.7 +#$ ignore: ^\*\*\* a.*
     1.8 +
     1.9  hg extdiff -o -NprcC5
    1.10  
    1.11  #$ name: