protobuf: switch to cmake

[paperchalice]

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---

Upstream removed all autotools usage. See protocolbuffers/protobuf#10132.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.

[rst0git]

The changes in this commit are causing the following build error with find_package (Protobuf 3.0.0 REQUIRED):

-- Found BISON: /usr/local/opt/bison/bin/bison (found suitable version "3.8.2", minimum required is "3.0") 
CMake Error at /usr/local/Cellar/cmake/3.25.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:[23](https://github.com/p4lang/p4c/actions/runs/4092947659/jobs/7065731355#step:5:24)0 (message):
  Could NOT find Protobuf (missing: Protobuf_LIBRARIES) (found suitable
  version "3.21.12", minimum required is "3.0.0")
-- Configuring incomplete, errors occurred!
Call Stack (most recent call first):
See also "/Users/runner/work/p4c/p4c/build/CMakeFiles/CMakeOutput.log".
  /usr/local/Cellar/cmake/3.[25](https://github.com/p4lang/p4c/actions/runs/4092947659/jobs/7065731355#step:5:26).2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:600 (_FPHSA_FAILURE_MESSAGE)
See also "/Users/runner/work/p4c/p4c/build/CMakeFiles/CMakeError.log".
  /usr/local/Cellar/cmake/3.25.2/share/cmake/Modules/FindProtobuf.cmake:650 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:117 (find_package)