Merge pull request #224 from mathworks/grpc

stop Git from recursively cloning submodules when cloning gRPC

Author: duncanpo

CMakeLists.txt

@@ -170,6 +170,7 @@ if(WITH_OTLP_GRPC)
        ${GRPC_PACKAGE_NAME}
        GIT_REPOSITORY ${GRPC_GIT_REPOSITORY}
        GIT_TAG ${GRPC_GIT_TAG}
+       GIT_SUBMODULES_RECURSE OFF
        PREFIX ${GRPC_PREFIX}
        UPDATE_DISCONNECTED 1
        PATCH_COMMAND ${GRPC_PATCH_CMD}