link lib32z1-dev when building 32-bit library

Author: ygj6

ci/build_cmake.sh

@@ -20,12 +20,13 @@ if [ "${ARCH}" == "32" ]
 then
     export BIT32="ON"
     export ARCH_FLAG="-m32"
+    ZLIB32="-DZLIB_LIBRARY=/usr/lib32/libz.a"
 else
     export BIT32="OFF"
     export ARCH_FLAG="-m64"
 fi
 
-cmake -DMSGPACK_CXX11=${CXX11} -DMSGPACK_CXX17=${CXX17} -DMSGPACK_32BIT=${BIT32} -DMSGPACK_CHAR_SIGN=${CHAR_SIGN} -DMSGPACK_DEFAULT_API_VERSION=${API_VERSION} -DMSGPACK_USE_X3_PARSE=${X3_PARSE} -DCMAKE_CXX_FLAGS=${ARCH_FLAG} ..
+cmake -DMSGPACK_CXX11=${CXX11} -DMSGPACK_CXX17=${CXX17} -DMSGPACK_32BIT=${BIT32} -DMSGPACK_CHAR_SIGN=${CHAR_SIGN} -DMSGPACK_DEFAULT_API_VERSION=${API_VERSION} -DMSGPACK_USE_X3_PARSE=${X3_PARSE} -DCMAKE_CXX_FLAGS=${ARCH_FLAG} ${ZLIB32} ..
 
 ret=$?
 if [ $ret -ne 0 ]