[CMake] Recursive list append

[Diablo 666]

> CMakeLists.txt:
> ###############
> set(some_list val1 val2 val3)
> add_subdirectory(subdir)
> message(STATUS "some_list = ${some_list}")
> 
> subdir/CMakeLists.txt:
> ######################
> # append in local scope
> list(APPEND some_list val4 val5 val6)
> # set in parent scope
> set(some_list "${some_list}" PARENT_SCOPE)


this is ugly. Really ugly. I like it :-D

Thanks a lot!
 		 	   		  
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