ci: sync CFLite with OSS-Fuzz

It's a follow-up to google/oss-fuzz#7395

Author: evverx

.clusterfuzzlite/Dockerfile

@@ -5,5 +5,7 @@ COPY . $SRC/elfutils
 RUN git clone --depth 1 https://github.com/google/oss-fuzz && \
     cp oss-fuzz/projects/elfutils/build.sh $SRC/ && \
     cp oss-fuzz/projects/elfutils/fuzz-dwfl-core.c $SRC/ && \
+    cp oss-fuzz/projects/elfutils/fuzz-libdwfl.c $SRC/ && \
+    cp oss-fuzz/projects/elfutils/fuzz-libelf.c $SRC/ && \
     cp oss-fuzz/projects/elfutils/fuzz-dwfl-core_seed_corpus.zip $SRC/
 WORKDIR elfutils