message: Update zlib version for cmake build
  In cmake build, the zlib version was `50893291621658f355bc5b4d450a8d06a563053d`
  which is equal to v1.2.8. This creates a discrepancy between cmake and bazel build.
  This fix updates the zlib version to v1.2.11 that syncs with bazel build.
diff: @@ -31,7 +31,8 @@ else (systemlib_ZLIB)
  set(ZLIB_URL https://github.com/madler/zlib)
  set(ZLIB_BUILD ${CMAKE_CURRENT_BINARY_DIR}/zlib/src/zlib)
  set(ZLIB_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/zlib/install)
  - set(ZLIB_TAG 50893291621658f355bc5b4d450a8d06a563053d)
  + # Match zlib version in tensorflow/workspace.bzl
  + set(ZLIB_TAG v1.2.11)
  if(WIN32)
  if(${CMAKE_GENERATOR} MATCHES "Visual Studio.*")
  