ENH: ITKv5_CONST macro for VerifyPreconditions() and VerifyInputInformation()
ENH: ITKv5_CONST macro for VerifyPreconditions() and VerifyInputInformation()

ITKv5_CONST was introduced on 2018-11-12 by commit
5141d32e39a277318ca0efbbec2e3f68980d3193.
We now define the same macro in ITK 4.13,
so the user applications can build easily
against either version 4 or 5 of the toolkit.

richardbeare/ITK,fbudin69500/ITK,blowekamp/ITK,Kitware/ITK,Kitware/ITK,blowekamp/ITK,BRAINSia/ITK,LucasGandel/ITK,fbudin69500/ITK,richardbeare/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,thewtex/ITK,malaterre/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,richardbeare/ITK,hjmjohnson/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,fbudin69500/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,LucasGandel/ITK,richardbeare/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,blowekamp/ITK,LucasGandel/ITK,blowekamp/ITK,BRAINSia/ITK,malaterre/ITK,thewtex/ITK,vfonov/ITK,spinicist/ITK,fbudin69500/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,richardbeare/ITK,malaterre/ITK,Kitware/ITK,vfonov/ITK,blowekamp/ITK,vfonov/ITK,richardbeare/ITK,spinicist/ITK,thewtex/ITK,malaterre/ITK,hjmjohnson/ITK,spinicist/ITK,spinicist/ITK,LucasGandel/ITK,richardbeare/ITK,hjmjohnson/ITK,vfonov/ITK,BRAINSia/ITK,BRAINSia/ITK,fbudin69500/ITK,hjmjohnson/ITK,BRAINSia/ITK,Kitware/ITK,thewtex/ITK,malaterre/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,spinicist/ITK,hjmjohnson/ITK,fbudin69500/ITK,vfonov/ITK,spinicist/ITK,fbudin69500/ITK,blowekamp/ITK,malaterre/ITK,spinicist/ITK,blowekamp/ITK,BRAINSia/ITK,fbudin69500/ITK,LucasGandel/ITK,Kitware/ITK,LucasGandel/ITK,LucasGandel/ITK,hjmjohnson/ITK,spinicist/ITK,malaterre/ITK,thewtex/ITK,hjmjohnson/ITK,blowekamp/ITK,BRAINSia/ITK,spinicist/ITK