Steven Wu 4ba360d499 [CMake] Fix FindGRPC cmake module to allow different layering
Take the library target out of `generate_protos` function so the caller
can decide where to layer the library using the source generated from
the function.

Fixes: https://github.com/llvm/llvm-project/issues/58075

Reviewed By: sammccall

Differential Revision: https://reviews.llvm.org/D135712
2022-10-12 15:35:26 -07:00
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