[HEADSUP] flex/lex updated to 2.5.37 (from flex.sourceforge.net)

[Jung-uk Kim]

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Please note flex/lex was updated to 2.5.37 from flex.sourceforge.net and
__FreeBSD_version was bumped to 1000033.

FYI, I added couple of compatibility shims (just enough to build the
previous source trees) but it is not 100% compatible with the old
version.  OTOH, this version is far more popular and third-party
sources often require this version.  Most importantly, NetBSD,
DragonFly BSD, and Mac OS X already adopted it for the same reason.

Cheers!

Jung-uk Kim
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