COMP: Documentation CMake target must come before add_custom_command.
COMP: Documentation CMake target must come before add_custom_command.

CMake Warning (dev) at Utilities/Doxygen/CMakeLists.txt:142 (add_custom_command):
   Policy CMP0040 is not set: The target in the TARGET signature of
   add_custom_command() must exist.  Run "cmake --help-policy CMP0040" for
   policy details.  Use the cmake_policy command to set the policy and
   suppress this warning.

   The target name "Documentation" is unknown in this context.

Also add POST_BUILD to the command signature.

Change-Id: Ia18a1313ec3fd4949e4291a6d40b3be935582e23

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