ENH: download cache only for the first dependency on MacOS
ENH: download cache only for the first dependency on MacOS

This is analogous to Linux Python package build process

KitwareMedical/ITKUltrasound,KitwareMedical/ITKUltrasound,thewtex/ITKUltrasound,thewtex/ITKUltrasound,KitwareMedical/ITKUltrasound,thewtex/ITKUltrasound