Add check bison version in configure.ac file.
To build correctly matiec we need bison greater or equals than 2.4 version.
Now the "configure" script is able to check if system has correctly requirements.

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matiec (2009.0-%DATEVERSION%) unstable; urgency=low

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  * Initial release (Closes: #nnnn)  <nnnn is the bug number of your ITP>

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 -- edouard <edouard.tisserant@gmail.com>  Wed, 21 Nov 2007 17:01:50 +0100

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