message: Add flags_compatibility script for fuchsia bots.
  Cr-Commit-Position: refs/heads/main@{#38277}
diff: @@ -86,9 +86,7 @@ class WebRTCMetaBuildWrapper(mb.MetaBuildWrapper):
  '--logcat-output-file', '${ISOLATED_OUTDIR}/logcats',
  '--store-tombstones'
  ]
  - elif is_fuchsia:
  - cmdline += ['bin/run_%s' % target]
  - elif is_ios:
  + elif is_ios or is_fuchsia:
  cmdline += [
  vpython_exe, '../../tools_webrtc/flags_compatibility.py',
  'bin/run_%s' % target
  