Use config mode for TBB finder

[darix]

Hi,

I am currently working on enabling USD support in the openSUSE Blender package.

With the help of a friend I was able to figure out why the finder couldn't find our tbb libraries although we had the cmake files installed in the tbb-devel package.

This resulted in the patch below:

system-tbb.patch.txt

Would that be something you would incorporate also upstream?

[jesschimein]

Filed as internal issue #USD-10679

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[darix]

and as a follow up question ... making the install process respect cmake install paths a bit more :)

currently a few paths seem to use prefix/subdir and libdir is also ignored.