[Bug 216707] exp-run: Update lang/gcc from GCC 4.9 to GCC 5

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216707

--- Comment #4 from Gerald Pfeifer <gerald at FreeBSD.org> ---
(In reply to Pedro F. Giffuni from comment #3)
> This said, why not jump directly to GCC6 instead of GCC5?

In my experience every GCC update runs into a number of broken ports
(usually software not compliant with C or C++ standards or those
"cleverly" using -Werror and then triggering new warnings).  

While going from 4.9 to 6 would not double that number over going to 6,
I guess it would be at least 50% or more above. (See the dependencies in
PR 196712 for how much pain that last update was.)

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