COMP: Avoid incompatible pointer warning
COMP: Avoid incompatible pointer warning

In SharedForward, the call to execvp warned on MinGW because the
signature declared in process.h has an extra const.  We use an explicit
cast to convert the pointer type.

BlueBrain/ITK,atsnyder/ITK,malaterre/ITK,spinicist/ITK,jmerkow/ITK,PlutoniumHeart/ITK,malaterre/ITK,jmerkow/ITK,zachary-williamson/ITK,fedral/ITK,CapeDrew/DITK,heimdali/ITK,daviddoria/itkHoughTransform,atsnyder/ITK,InsightSoftwareConsortium/ITK,jcfr/ITK,vfonov/ITK,cpatrick/ITK-RemoteIO,rhgong/itk-with-dom,daviddoria/itkHoughTransform,eile/ITK,spinicist/ITK,stnava/ITK,eile/ITK,fedral/ITK,thewtex/ITK,spinicist/ITK,eile/ITK,spinicist/ITK,LucHermitte/ITK,fuentesdt/InsightToolkit-dev,GEHC-Surgery/ITK,itkvideo/ITK,biotrump/ITK,fedral/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,fedral/ITK,wkjeong/ITK,spinicist/ITK,GEHC-Surgery/ITK,InsightSoftwareConsortium/ITK,paulnovo/ITK,jmerkow/ITK,vfonov/ITK,ajjl/ITK,LucasGandel/ITK,fuentesdt/InsightToolkit-dev,CapeDrew/DCMTK-ITK,fuentesdt/InsightToolkit-dev,vfonov/ITK,msmolens/ITK,daviddoria/itkHoughTransform,LucHermitte/ITK,fbudin69500/ITK,jmerkow/ITK,itkvideo/ITK,vfonov/ITK,eile/ITK,blowekamp/ITK,jmerkow/ITK,rhgong/itk-with-dom,fedral/ITK,fbudin69500/ITK,daviddoria/itkHoughTransform,hendradarwin/ITK,BRAINSia/ITK,PlutoniumHeart/ITK,heimdali/ITK,hinerm/ITK,cpatrick/ITK-RemoteIO,CapeDrew/DCMTK-ITK,vfonov/ITK,malaterre/ITK,eile/ITK,CapeDrew/DCMTK-ITK,LucHermitte/ITK,paulnovo/ITK,msmolens/ITK,jcfr/ITK,BRAINSia/ITK,itkvideo/ITK,msmolens/ITK,hendradarwin/ITK,Kitware/ITK,BlueBrain/ITK,itkvideo/ITK,rhgong/itk-with-dom,InsightSoftwareConsortium/ITK,LucasGandel/ITK,atsnyder/ITK,LucasGandel/ITK,hjmjohnson/ITK,BRAINSia/ITK,fbudin69500/ITK,CapeDrew/DCMTK-ITK,hendradarwin/ITK,GEHC-Surgery/ITK,rhgong/itk-with-dom,ajjl/ITK,cpatrick/ITK-RemoteIO,cpatrick/ITK-RemoteIO,fedral/ITK,atsnyder/ITK,fbudin69500/ITK,eile/ITK,Kitware/ITK,heimdali/ITK,eile/ITK,BRAINSia/ITK,fuentesdt/InsightToolkit-dev,jcfr/ITK,biotrump/ITK,blowekamp/ITK,paulnovo/ITK,malaterre/ITK,msmolens/ITK,jmerkow/ITK,CapeDrew/DCMTK-ITK,jcfr/ITK,richardbeare/ITK,spinicist/ITK,malaterre/ITK,daviddoria/itkHoughTransform,ajjl/ITK,BlueBrain/ITK,blowekamp/ITK,rhgong/itk-with-dom,BlueBrain/ITK,heimdali/ITK,PlutoniumHeart/ITK,spinicist/ITK,paulnovo/ITK,GEHC-Surgery/ITK,hinerm/ITK,zachary-williamson/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,atsnyder/ITK,blowekamp/ITK,LucHermitte/ITK,fuentesdt/InsightToolkit-dev,ajjl/ITK,hinerm/ITK,zachary-williamson/ITK,CapeDrew/DITK,richardbeare/ITK,fedral/ITK,CapeDrew/DITK,thewtex/ITK,hendradarwin/ITK,stnava/ITK,Kitware/ITK,fedral/ITK,CapeDrew/DCMTK-ITK,Kitware/ITK,heimdali/ITK,stnava/ITK,msmolens/ITK,daviddoria/itkHoughTransform,wkjeong/ITK,hendradarwin/ITK,fbudin69500/ITK,BlueBrain/ITK,CapeDrew/DITK,blowekamp/ITK,itkvideo/ITK,zachary-williamson/ITK,stnava/ITK,cpatrick/ITK-RemoteIO,LucHermitte/ITK,hendradarwin/ITK,ajjl/ITK,CapeDrew/DITK,thewtex/ITK,PlutoniumHeart/ITK,wkjeong/ITK,atsnyder/ITK,hinerm/ITK,hjmjohnson/ITK,atsnyder/ITK,malaterre/ITK,stnava/ITK,rhgong/itk-with-dom,malaterre/ITK,jcfr/ITK,spinicist/ITK,BRAINSia/ITK,cpatrick/ITK-RemoteIO,BlueBrain/ITK,itkvideo/ITK,jmerkow/ITK,hinerm/ITK,hinerm/ITK,CapeDrew/DITK,CapeDrew/DITK,vfonov/ITK,PlutoniumHeart/ITK,LucasGandel/ITK,atsnyder/ITK,BRAINSia/ITK,hinerm/ITK,richardbeare/ITK,jcfr/ITK,paulnovo/ITK,stnava/ITK,fuentesdt/InsightToolkit-dev,hinerm/ITK,eile/ITK,LucHermitte/ITK,richardbeare/ITK,biotrump/ITK,malaterre/ITK,fbudin69500/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,wkjeong/ITK,spinicist/ITK,wkjeong/ITK,blowekamp/ITK,fuentesdt/InsightToolkit-dev,ajjl/ITK,msmolens/ITK,fuentesdt/InsightToolkit-dev,atsnyder/ITK,ajjl/ITK,daviddoria/itkHoughTransform,thewtex/ITK,rhgong/itk-with-dom,PlutoniumHeart/ITK,BRAINSia/ITK,msmolens/ITK,GEHC-Surgery/ITK,GEHC-Surgery/ITK,Kitware/ITK,GEHC-Surgery/ITK,wkjeong/ITK,hjmjohnson/ITK,Kitware/ITK,cpatrick/ITK-RemoteIO,fuentesdt/InsightToolkit-dev,vfonov/ITK,hjmjohnson/ITK,itkvideo/ITK,biotrump/ITK,zachary-williamson/ITK,biotrump/ITK,LucHermitte/ITK,jmerkow/ITK,CapeDrew/DITK,LucasGandel/ITK,BlueBrain/ITK,hjmjohnson/ITK,paulnovo/ITK,heimdali/ITK,Kitware/ITK,hinerm/ITK,ajjl/ITK,hjmjohnson/ITK,heimdali/ITK,msmolens/ITK,richardbeare/ITK,paulnovo/ITK,itkvideo/ITK,LucHermitte/ITK,wkjeong/ITK,fbudin69500/ITK,biotrump/ITK,InsightSoftwareConsortium/ITK,CapeDrew/DITK,eile/ITK,thewtex/ITK,blowekamp/ITK,richardbeare/ITK,zachary-williamson/ITK,CapeDrew/DCMTK-ITK,LucasGandel/ITK,zachary-williamson/ITK,itkvideo/ITK,zachary-williamson/ITK,vfonov/ITK,daviddoria/itkHoughTransform,thewtex/ITK,stnava/ITK,GEHC-Surgery/ITK,paulnovo/ITK,jcfr/ITK,PlutoniumHeart/ITK,stnava/ITK,hendradarwin/ITK,wkjeong/ITK,daviddoria/itkHoughTransform,heimdali/ITK,CapeDrew/DCMTK-ITK,biotrump/ITK,malaterre/ITK,biotrump/ITK,PlutoniumHeart/ITK,fbudin69500/ITK,zachary-williamson/ITK,jcfr/ITK,CapeDrew/DCMTK-ITK,stnava/ITK,BlueBrain/ITK,cpatrick/ITK-RemoteIO,LucasGandel/ITK,hjmjohnson/ITK,hendradarwin/ITK,blowekamp/ITK,richardbeare/ITK,rhgong/itk-with-dom