Drop rpclib support

centos-7/Dockerfile

@@ -251,20 +251,6 @@ RUN version=2.3.0 && \
     cd .. && \
     rm -rf pybind11-${version}*
 
-# rpclib
-RUN version=2.2.1 && \
-    source /etc/profile && \
-    cd /tmp && \
-    curl -sSL -o rpclib-${version}.tar.gz https://github.com/rpclib/rpclib/archive/v2.2.1.tar.gz && \
-    tar -xf rpclib-${version}.tar.gz && \
-    cd rpclib-${version} && \
-    cmake -S. -B build -G Ninja \
-        -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local \
-        && \
-    ninja -C build install && \
-    cd .. && \
-    rm -rf rpclib-${version}*
-
 # Python 3.7
 RUN version=3.7.5 && \
     yum install -y \