ENH: Update to newer third-party update script from CMake
ENH: Update to newer third-party update script from CMake

Use the CMake `Utilities/Scripts/update-third-party.bash` as of commit
`693f4c70ff`.  Manually preserve ITK's change from commit 5dccc2207e
(BUG: Do not gpg sign third party updates, 2018-11-19, v5.0b02~82^2~1).

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