[Bug 231590] [exp-run] Update GCC_DEFAULT from 7 to 8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231590

            Bug ID: 231590
           Summary: [exp-run] Update GCC_DEFAULT from 7 to 8
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: gerald at FreeBSD.org
                CC: jbeich at FreeBSD.org, ports-bugs at FreeBSD.org,
                    tobik at freebsd.org
             Flags: exp-run?

After late updates to GCC 4.8 and GCC 4.9 (both of which were unmaintained
upstream at that point), with GCC 5 we were ahead of the curve a little,
and the updates to GCC 6 and GCC 7 came when these had at least a year
of upstream lifetime left.

Let's see whether we can now move to the latest upstream release series,
GCC 8, which would be unprecedented since the update to GC 4.2 (in base
back then)!

This *should* be easier now, with many ports fixed during those upgrades
above (be it in terms of code, be it in terms of honoring CFLAGS and the
like, be it in terms of yanking them from the tree, updating to a newer
version,...).


Sooo, let's see how many ports need to be fixed (once again), and how
long that takes this time...

https://gcc.gnu.org/gcc-8/porting_to.html and
https://gcc.gnu.org/gcc-8/changes.html may be useful resources for
anyone helping.

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