[Toybox] [PATCH] chmod: fix -R and dangling symlinks.

[enh]

Found trying to run the libc++ tests.

For coreutils, `info chmod` says:

  'chmod' ignores symbolic links encountered during recursive directory
  traversals.

Bug: http://b/155809792
---
 tests/chmod.test   |  7 +++++++
 toys/posix/chmod.c | 20 +++++++++++++-------
 2 files changed, 20 insertions(+), 7 deletions(-)
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