message: drakefile: Remove dup hard-coded zlib version.
diff: @@ -256,7 +256,7 @@ def configure(cxx_toolkit = None,
  zlib_env['CC'] = cxx_toolkit.cxx[:-4] + '-gcc'
  if cxx_toolkit.os is drake.os.macos:
  zlib_env['CC'] = cxx_toolkit.c
  - zlib_lib = drake.cxx.DynLib('zlib/lib/libz.1.2.8.dylib')
  + zlib_lib = drake.cxx.DynLib('zlib/lib/libz.%s.dylib' % zlib_version)
  elif cxx_toolkit.os in [drake.os.linux]:
  zlib_env['CC'] = cxx_toolkit.c
  zlib_lib = drake.cxx.DynLib('zlib/lib/libz.so.1')
  