[CMake] Using FetchContent fails when two subprojects have a target with the same name

[Timothy Wrona]

I am having an issue with using FetchContent to grab two subprojects that
both contain a "doxygen" target to build the documentation.

Both of these subprojects need to be able to be built independently and
when built on their own they compile fine (along with their documentation),
but when I pull them into one project using "FetchContent" I get an error
saying I can't define the "doxygen" target more than once.

I imagine this kind of issue would come up all of the time when using a
"superbuild" pattern. Is there a typical way of handling this?
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