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build: Don't require exact match in the bison check

Autoconf changed its way to use bison several years ago:

It haven't been made available in any release, but it is possible for distributions to backport the commit into their packages, causing the bison check to fail. Specifically, it already happens on FreeBSD.

Therefore, instead of requiring an exact match, the check is changed to only require the variable is started with 'bison' and a white space.

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