message: Fix incorrect get_link_flags on Mac
  This fix tries to address the issue raised in 30633 where
  `tf.sysconfig.get_link_flags` on mac returned
  '-l:libtensorflow_framework.1.dylib' which is not valid
  for ld on macOS.
  This fix changes to `-ltensorflow_framework.1`
  This fix fixes 30633.
diff: @@ -80,7 +80,7 @@ def get_link_flags():
  if not _MONOLITHIC_BUILD:
  flags.append('-L%s' % get_lib())
  if is_mac:
  - flags.append('-l:libtensorflow_framework.%s.dylib' % ver)
  + flags.append('-ltensorflow_framework.%s' % ver)
  else:
  flags.append('-l:libtensorflow_framework.so.%s' % ver)
  return flags
  