[libc++] Fix oss-fuzz build

GitOrigin-RevId: 4210b87020b9e558f650993d6a274807083ac5f6
diff --git a/utils/ci/oss-fuzz.sh b/utils/ci/oss-fuzz.sh
index d8a1e5e..50c63b4 100755
--- a/utils/ci/oss-fuzz.sh
+++ b/utils/ci/oss-fuzz.sh
@@ -14,7 +14,9 @@
     ${CXX} ${CXXFLAGS} \
         -std=c++14 \
         -DLIBCPP_OSS_FUZZ \
+        -D_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS \
         -nostdinc++ -cxx-isystem libcxx/include \
+        -lpthread -ldl \
         -o "${OUT}/${exe}" \
         ${test} \
         ${LIB_FUZZING_ENGINE}