[CMake] Language Dependency for TCL?

[hex]

I didn't know about Tclsh. I see now it is part of TCL. This is useful, 
thank you.

> Probably because the following isn't properly set if you don't enable 
> a language:
> CMAKE_FIND_LIBRARY_SUFFIXES
> CMAKE_FIND_LIBRARY_PREFIXES
>
> You could probably just use "find_package(Tclsh)" to just find the shell.
> https://cmake.org/cmake/help/v3.14/module/FindTclsh.html
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