[Bug 229885] benchmarks/stress-ng isn't broken on i386, something else is.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229885

            Bug ID: 229885
           Summary: benchmarks/stress-ng isn't broken on i386, something
                    else is.
           Product: Ports & Packages
           Version: Latest
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: pizzamig at freebsd.org
          Reporter: dewayne at heuristicsystems.com.au
          Assignee: pizzamig at freebsd.org
             Flags: maintainer-feedback?(pizzamig at freebsd.org)

I last built stress-ng-0.09.27.txz on i386 on 30th May on a FreeBSD 11.1Stable
which was built around late April.  

After upgrading to latest 11.2Stable with clang 6.0.1 and rebuilding stress-ng
0.09.33 I obtain lots of messages like
stress-atomic.c:(.text+0x467): undefined reference to `__atomic_fetch_sub_8'
which is why the maintainer marked this port as broken in the Makefile.

So I went hunting, as I'm experiencing quite a few other ports problems.  I
switched into a revert/build cycle and attempted to rebuild back to 0.09.23. 
All experienced the same failure.  So... the problem isn't with stress-ng.

I've found that its quickest to simply force the build with gcc7, which in this
case easily rebuilt stress-ng 0.09.23 AND stress-ng-0.09.33.

I suspect clang 6.0.X so I need to revert clang from 6.0.1 back to 5.0.0; but
without reverting the buildworld as it would be preferable to establish that
other libraries (or the kernel) weren't the issue. But how?

stress-ng 0.09.33 built and ran cleanly on amd64 under clang 6.0.1

Aside and incidentally, other ports that I had to modify build attributes for 
were: textproc/htdig sysutils/npadmin net/isc-dhcp44-* on both i386 & amd64. 
security/openssh-portable has only had a flavored enhancement but building has
proven intractable in our environ, we enable one option BSM...

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