Compile Error fix on Linux Mint

[ratsalad]

-- Adding CPU backend variant ggml-cpu: -msse4.2;-mavx GGML_SSE42;GGML_AVX
CMake Error at examples/grpc-server/CMakeLists.txt:38 (find_package):
Could not find a package configuration file provided by "Protobuf" with any
of the following names:

ProtobufConfig.cmake
protobuf-config.cmake

Add the installation prefix of "Protobuf" to CMAKE_PREFIX_PATH or set
"Protobuf_DIR" to a directory containing one of the above files. If
"Protobuf" provides a separate development package or SDK, be sure it has
been installed.

-- Configuring incomplete, errors occurred!
make[3]: *** [Makefile:74: grpc-server] Error 1
make[3]: Leaving directory '/home/jim/LocalAI/backend/cpp/llama-avx'
make[2]: *** [Makefile:776: build-llama-cpp-grpc-server] Error 2
make[2]: Leaving directory '/home/jim/LocalAI'
make[1]: *** [Makefile:798: backend-assets/grpc/llama-cpp-avx] Error 2
make[1]: Leaving directory '/home/jim/LocalAI'
make: *** [Makefile:391: rebuild] Error 2