[MacPorts] #53925: flex: Update to 2.6.3

Sat Apr 8 20:44:19 UTC 2017

So one issue -- there seems to be a bug in flex 2.6.3 with things
that specify the nodefault option. Haven't hit it myself but there
are complaints in the bug tracker on github.

I believe the attached patch from the development version is needed.

Perry
-- 
Perry E. Metzger		perry at piermont.com
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