[CMake] COMPILE_FLAGS property that appends instead of replaces

[Robert Dailey]

I would like to set the COMPILE_FLAGS property multiple times on the same
target through set_target_properties(), however only the last call seems to
persist. Previous flags set get overridden. Is this the correct behavior?
If so, is there a way to make this property append instead of replace on
the same target?

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Robert Dailey
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