[Rd] ActiveTCL has non open-source license

[Vassil Kakaradov]

https://cran.r-project.org/doc/manuals/R-admin.html#Installing-R-under-macOS
https://www.activestate.com/activetcl/downloads links to ActiveTCL which
has non open-source license:
http://docs.activestate.com/activetcl/8.5/get/license/
"ActiveState Confidential Information includes the Software, including all
source and object code, and all associated documentation, but not
Accessible Code."

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