cfl: disable building protobuf library

The patch disables building protobuf library, this will speed up
overall build time significantly.

Author: ligurio

.clusterfuzzlite/Dockerfile

@@ -8,7 +8,8 @@ FROM gcr.io/oss-fuzz-base/base-builder:v1
 
 RUN apt-get update && apt-get install -y \
 	build-essential ninja-build cmake make \
-	libreadline-dev libunwind-dev zlib1g-dev
+	libreadline-dev libunwind-dev zlib1g-dev \
+	protobuf-compiler libprotobuf-dev
 
 COPY . $SRC/lua-c-api-tests
 WORKDIR $SRC/lua-c-api-tests

.clusterfuzzlite/build.sh

@@ -29,6 +29,7 @@ esac
 cmake_args=(
     -DUSE_LUAJIT=ON
     -DOSS_FUZZ=ON
+    -DENABLE_BUILD_PROTOBUF=OFF
     $SANITIZERS_ARGS
 
     # C compiler