ENH: Build shared libs with GNU on Windows
ENH: Build shared libs with GNU on Windows

The GNU toolchain on windows supports automatic dllexport of all symbols
in a library.  This simulates the everything-is-public methodology of
UNIX systems.  Therefore we can build vxl and ITK libraries as shared
even though the sources do not all contain export macro markup.

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