[Bug 227659] [PATCH] src.opts.mk: fix to build WITH_GCC=yes when using an external compiler that supports c++11

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227659

--- Comment #4 from Kenneth Salerno <kennethsalerno at yahoo.com> ---
(In reply to Mark Millard from comment #2)
Thank you, Mark, for sharing all of your experiences. I have been using an
external comliler since 11.0-RELEASE, and have found 10.x to be impossible to
hack for gcc6 on i386 (I can get it to compile, but it will segfault
somewhere). I wasn't able to use 10.x on my ppc64 QEMU guest in any form so
wasn't attempting external compilers for that version back then.

In general using an external compiler exposes just how fragile the whole system
is because of idiocintricies or bugs of specific compiler versions, but it is
getting easier and easier since 11.0. And I would prefer to not have to resort
to running HEAD, so I retro-patch a currently supported releng version instead.

11.0 was the only version I was able to get a working kernel compiled with gcc5
and gcc, for both i386 and ppc64. Starting with 11.1 I needed to mix a kernel
built with the system compiler, even for i386 where I am using devel/llvm60
that breaks the iwi device driver (won't scan for networks) and for some reason
multimedia/mplayer segfaults when built with any compiler besides the system
compiler.

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