KWSys: Remove useless include <sys/procfs.h> (#11648)
KWSys: Remove useless include <sys/procfs.h> (#11648)

The header was included only under "#ifdef __linux", but not all Linux
distributions provide the header.  SystemInformation uses no symbols
from this header, so do not include it.

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