libtool_2.4.bb: Set DEFAULT_PREFERENCE to -1
libtool_2.4.bb: Set DEFAULT_PREFERENCE to -1

* Its not default so disable it being picked by mistake
  one should enable it explicitly.
  This means by default we still use 2.2.6b

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

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