add openssl dev library for cross compilation (#546)

Author: AppleThomas

cluster/docker/sv-dune.Dockerfile

@@ -14,7 +14,7 @@ RUN apt-get update && \
     clang \
     libclang-dev \
     && xx-apt-get update  \
-    && xx-apt-get install -y libc6-dev g++ binutils \
+    && xx-apt-get install -y libc6-dev g++ binutils libssl-dev \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*