[CMake] Check if a target has been added

[Félix C. Morency]

Hi,

I posted a message yesterday and found out that the method wasn't quite
effective. If there any way of checking if a target has already been added
to the build chain (resetting it at each configure) ? I have lots of
projects depending on the same target and this produces makefile warnings
and VS. annoying popups.

Cheers,
Félix
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