message: Fix building against system zlib
diff: #include <cstdlib>
  #include "base/logging.h"
  #ifdef USE_SYSTEM_ZLIB
  -#include "src/zlib.h" // NOLINT
  +#include "zlib.h" // NOLINT
  #include "zconf.h" // NOLINT
  #else
  #include "third_party/zlib/src/zlib.h"
  