fix clang build ImageMagic and GraphicsMagick

[Paul Ambrose]

Hi, mm and Mark,
      sorry my misuse for previous mail, I found that the these two
ports building failure is because the exception.sh test (for
ImageMagic) and exception.sh & attribute.sh (for GraphicsMagick) are
vulnerable to -O2 optimization (for CXXFLAGS). So
my fix is samply to lower -O2 optimization to -O1, I test is on both
stable 9, but I do not know ports makefile much, can
not give a patch.

here is my test,
============================================
#cd ports/graphics/ImageMagick;
#make CC=clang CXX=clang++ CXXFLAGS=-O1

在 2011年12月21日 上午1:06，Mark Linimon <linimon at lonesome.com> 写道：
> I have recently been able to get the new build cluster on pointyhat-west
> set up to run full builds of ports with clang on amd64-9.  I have documented
> the latest results on the wiki:
>
>  http://wiki.freebsd.org/PortsAndClang
>
> If you are interested in working on ports being built via clang, this
> is your place to start.
>
> Please also note that now that we have up-to-date builds going, it is
> not as useful to us to report individual clang build failures.  Patches
> to fix problems are, of course, highly welcome.
>
> mcl
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