make sure libpython is not linked

Dockerfile

@@ -7,6 +7,7 @@ RUN yum install -y epel-release && \
         git \
         ceph-common \
         librados-devel \
+        patch \
         bzip2 \
         centos-release-scl
 RUN yum install -y devtoolset-7-gcc-c++
@@ -26,6 +27,9 @@ WORKDIR /ceph/src/pybind/rados
 RUN mkdir -p /wheelhouse
 
 COPY build.sh .
+COPY ldflag.patch .
+RUN patch setup.py ldflag.patch
+
 RUN conda create -n py27 "python <3" cython wheel && \
     rm -rf build dist && \
     scl enable devtoolset-7 "./build.sh py27"

ldflag.patch

+49c49
+<         if ldflag.startswith('-l'):
+---
+>         if ldflag.startswith('-l') and not ldflag.startswith('-lpython'):