gcc: add some configuration and references.
-Add configure support for FreeBSD 10 and 11. -Adapt a threading fix to gnu POSIX95 (which we don't use). -Refer to a bug fix for the disabled vrptree support.
This is all useless in our current build but it is included for convenience in case someone may want to re-package our older gcc.
Reviewed by: gerald (long ago)
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