[CMake] unset(PARENT_SCOPE)

[James Bigler]

If there is a set(PARENT_SCOPE) why isn't there an unset(PARENT_SCOPE)?  It
seems like a hole in the API.

I noticed this when I was trying to update my push_variable/pop_variable
functions.  I use set(PARENT_SCOPE) to set the variable outside of the
function, but when doing pop_variable I want to use unset(PARENT_SCOPE) if
the variable was undefined before push_variable.

Thanks,
James
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