tinderboxes please upgrade bison

[Tor Lillqvist]

OS X 10.8 has Bison 2.3 and I doubt Apple will be upgrading to anything
newer in the future either. We shouldn't be requiring anything newer,
unless we want to abandon our traditional policy that LibreOffice should be
buildable with a stock Xcode installation and no random collection of
add-on 3rd-party software. (Sure, we already have broken that promise a bit
as we require automake and autoconf, but do we *really* need any newer
features of Bison?)

--tml
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