COMP: update download location for pre-built ICU for Visual Studio
COMP: update download location for pre-built ICU for Visual Studio

ICU_1911_64 was not migrated to Girder instance at data.kitware.com

TODO: update *nix download location to GitHub:
https://github.com/unicode-org/icu/releases/download/release-58-3/icu4c-58_3-src.tgz

Change-Id: Ifd818245647741c501627ddda11e214b9732c8dc

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