[PATCH] remove libtool helper script before copying it

Hi,

[[[
* autogen.sh:
  Remove the libtool helper before trying to copy it.
  An ancient helper might already be present from previous builds,
  and it might be write-protected (e.g. mode 444, seen on FreeBSD).
  This causes cp to fail and print an error message, leaving
  behind a potentially outdated libtool helper.
]]]

VSP ("very simply patch") attached.

Thanks,

-- 
Stefan Sperling <stsp@elego.de>                 Software Developer
elego Software Solutions GmbH                            HRB 77719
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http://www.elego.de                 Geschaeftsfuehrer: Olaf Wagner