Disable gso for interop because sendmsg fails with EIO

interop/Dockerfile

@@ -13,7 +13,7 @@ RUN apt-get update && \
     make -j$(nproc) && make install-strip && cd .. && rm -rf nghttp3 && \
     git clone --depth 1 https://github.com/ngtcp2/ngtcp2 && \
     cd ngtcp2 && autoreconf -i && \
-    ./configure && \
+    ./configure CXXFLAGS=-DNGTCP2_ENABLE_UDP_GSO=0 && \
     make -j$(nproc) && make install-strip && cp examples/server examples/client /usr/local/bin && cd .. && rm -rf ngtcp2 && \
     strip /usr/local/lib/*.so.*.* /usr/local/lib/engines-*/*.so && \
     rm -rf /usr/local/lib/libssl.so /usr/local/lib/libcrypto.so /usr/local/lib/libssl.a /usr/local/lib/libcrypto.a /usr/local/lib/pkgconfig/*ssl.pc /usr/local/include/openssl/* && \