CMake: add option for interface-only dependency on pthreadpool
CMake: add option for interface-only dependency on pthreadpool

Maratyszcza/NNPACK,Maratyszcza/NNPACK,microblink/NNPACK,Maratyszcza/NNPACK,microblink/NNPACK,microblink/NNPACK,microblink/NNPACK,Maratyszcza/NNPACK