Fuzz image: do not install C++ compiler and make sure submodules are cloned

.clusterfuzzlite/Dockerfile

@@ -1,5 +1,4 @@
 FROM gcr.io/oss-fuzz-base/base-builder-rust:v1
-RUN apt-get update && apt-get install -y llvm-dev libclang-dev clang && apt-get clean && rm --recursive --force /var/lib/apt/lists/*
 COPY . $SRC/oxigraph
 WORKDIR oxigraph
 COPY .clusterfuzzlite/build.sh $SRC/

.clusterfuzzlite/build.sh

@@ -14,6 +14,8 @@ function build_seed_corpus() {
 
 
 cd "$SRC"/oxigraph
+git submodule init
+git submodule update
 cargo fuzz build -O --debug-assertions
 for TARGET in sparql_eval sparql_results_json sparql_results_tsv sparql_results_xml n3 nquads trig rdf_xml
 do