[oe] do_split_packages and populate_packages_prepend

[Carlos Rafael Giani]

Hello,

I wonder if do_split_packages() can only be used inside a 
populate_packages_prepend() function. 
https://wiki.yoctoproject.org/wiki/Handling_optional_module_packaging 
seems to suggest this. Since _prepend is problematic. I tried to use 
prefuncs instead ( populate_packages[prefuncs] += " myfunc " ). But 
then, my function is not called.

So, is this a special case where _prepend must be used?

cheers