Use new zlib using multibuild scripts

Author: wiktorn

config.sh

@@ -5,17 +5,20 @@
 
 CMAKE_BIN_URL_64=https://cmake.org/files/v3.6/cmake-3.6.3-Linux-x86_64.sh
 CMAKE_BIN_URL_32=https://cmake.org/files/v3.6/cmake-3.6.3-Linux-i386.sh
+ZLIB_SOURCE=https://zlib.net/zlib-1.2.11.tar.gz
 
 function pre_build {
     # Any stuff that you need to do before you start building the wheels
     # Runs in the root directory of this repository.
+    build_new_zlib
+    build_bzip2
 
     RETURN_PWD="$(pwd)"
     if [ -n "$IS_OSX" ] ; then
         brew update
         brew install google-sparsehash || true
     else
-        yum install -y sparsehash-devel bzip2-devel zlib-devel
+        yum install -y sparsehash-devel
     fi
 
     ####