COMP: Remove unnecessary clang compiler option
COMP: Remove unnecessary clang compiler option

With the commit of the patch http://review.source.kitware.com/#/c/6025/
"COMP: Avoid C++0x constexpr error" the suppression
of this class of compiler warnings is no longer necessary
on the clang compiler. The code is now compliant with the
C++ standard without special compiler extensions.

Change-Id: I025e69e8b1e9a1fabffd1bbbdf5af0c9329cc2e9

richardbeare/ITK,blowekamp/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,jmerkow/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,LucasGandel/ITK,hinerm/ITK,BlueBrain/ITK,LucasGandel/ITK,hjmjohnson/ITK,spinicist/ITK,BRAINSia/ITK,blowekamp/ITK,InsightSoftwareConsortium/ITK,blowekamp/ITK,fedral/ITK,biotrump/ITK,spinicist/ITK,GEHC-Surgery/ITK,PlutoniumHeart/ITK,fbudin69500/ITK,jmerkow/ITK,LucHermitte/ITK,stnava/ITK,BlueBrain/ITK,msmolens/ITK,LucasGandel/ITK,vfonov/ITK,ajjl/ITK,spinicist/ITK,Kitware/ITK,zachary-williamson/ITK,thewtex/ITK,fedral/ITK,hendradarwin/ITK,LucHermitte/ITK,fbudin69500/ITK,Kitware/ITK,zachary-williamson/ITK,hendradarwin/ITK,hendradarwin/ITK,hinerm/ITK,BlueBrain/ITK,biotrump/ITK,jcfr/ITK,jmerkow/ITK,LucasGandel/ITK,stnava/ITK,biotrump/ITK,heimdali/ITK,stnava/ITK,PlutoniumHeart/ITK,jcfr/ITK,msmolens/ITK,PlutoniumHeart/ITK,jcfr/ITK,ajjl/ITK,eile/ITK,hinerm/ITK,stnava/ITK,fbudin69500/ITK,thewtex/ITK,malaterre/ITK,jcfr/ITK,jcfr/ITK,msmolens/ITK,msmolens/ITK,PlutoniumHeart/ITK,heimdali/ITK,heimdali/ITK,thewtex/ITK,atsnyder/ITK,ajjl/ITK,jcfr/ITK,eile/ITK,spinicist/ITK,GEHC-Surgery/ITK,zachary-williamson/ITK,jcfr/ITK,LucasGandel/ITK,hjmjohnson/ITK,BRAINSia/ITK,biotrump/ITK,fuentesdt/InsightToolkit-dev,thewtex/ITK,eile/ITK,heimdali/ITK,fedral/ITK,richardbeare/ITK,thewtex/ITK,ajjl/ITK,fbudin69500/ITK,vfonov/ITK,atsnyder/ITK,fuentesdt/InsightToolkit-dev,zachary-williamson/ITK,jmerkow/ITK,vfonov/ITK,vfonov/ITK,heimdali/ITK,BlueBrain/ITK,fbudin69500/ITK,atsnyder/ITK,msmolens/ITK,LucasGandel/ITK,GEHC-Surgery/ITK,ajjl/ITK,BRAINSia/ITK,spinicist/ITK,hjmjohnson/ITK,GEHC-Surgery/ITK,blowekamp/ITK,spinicist/ITK,fuentesdt/InsightToolkit-dev,LucasGandel/ITK,blowekamp/ITK,LucHermitte/ITK,zachary-williamson/ITK,spinicist/ITK,PlutoniumHeart/ITK,vfonov/ITK,zachary-williamson/ITK,ajjl/ITK,msmolens/ITK,malaterre/ITK,blowekamp/ITK,richardbeare/ITK,hjmjohnson/ITK,Kitware/ITK,biotrump/ITK,fuentesdt/InsightToolkit-dev,fuentesdt/InsightToolkit-dev,eile/ITK,stnava/ITK,GEHC-Surgery/ITK,fedral/ITK,atsnyder/ITK,malaterre/ITK,ajjl/ITK,hjmjohnson/ITK,hendradarwin/ITK,eile/ITK,atsnyder/ITK,zachary-williamson/ITK,BRAINSia/ITK,LucHermitte/ITK,zachary-williamson/ITK,LucHermitte/ITK,hinerm/ITK,eile/ITK,spinicist/ITK,stnava/ITK,hinerm/ITK,hjmjohnson/ITK,eile/ITK,jmerkow/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,malaterre/ITK,vfonov/ITK,Kitware/ITK,malaterre/ITK,LucHermitte/ITK,hinerm/ITK,fedral/ITK,vfonov/ITK,blowekamp/ITK,biotrump/ITK,jmerkow/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,biotrump/ITK,Kitware/ITK,atsnyder/ITK,hendradarwin/ITK,fedral/ITK,heimdali/ITK,eile/ITK,hinerm/ITK,BlueBrain/ITK,msmolens/ITK,BRAINSia/ITK,BlueBrain/ITK,hinerm/ITK,malaterre/ITK,GEHC-Surgery/ITK,richardbeare/ITK,hinerm/ITK,Kitware/ITK,PlutoniumHeart/ITK,BlueBrain/ITK,jcfr/ITK,atsnyder/ITK,fbudin69500/ITK,ajjl/ITK,hendradarwin/ITK,biotrump/ITK,stnava/ITK,InsightSoftwareConsortium/ITK,hendradarwin/ITK,fuentesdt/InsightToolkit-dev,PlutoniumHeart/ITK,richardbeare/ITK,GEHC-Surgery/ITK,fbudin69500/ITK,InsightSoftwareConsortium/ITK,fuentesdt/InsightToolkit-dev,jmerkow/ITK,LucHermitte/ITK,heimdali/ITK,fuentesdt/InsightToolkit-dev,BlueBrain/ITK,blowekamp/ITK,fedral/ITK,spinicist/ITK,vfonov/ITK,LucHermitte/ITK,GEHC-Surgery/ITK,heimdali/ITK,atsnyder/ITK,PlutoniumHeart/ITK,fuentesdt/InsightToolkit-dev,malaterre/ITK,eile/ITK,BRAINSia/ITK,vfonov/ITK,malaterre/ITK,atsnyder/ITK,hendradarwin/ITK,fedral/ITK,malaterre/ITK,richardbeare/ITK,fbudin69500/ITK,stnava/ITK,thewtex/ITK,zachary-williamson/ITK,msmolens/ITK,BRAINSia/ITK,richardbeare/ITK,jmerkow/ITK