Warn instead of error for recursive detection

[ath0mas]

As I am willing to update/fork rm-modules for the possible Out of memory I am facing too (hughsk/rm-modules#5), updating readdirp with version 3.5 and its "infinite loop" fix seems perfect,

3.5 (Oct 13, 2020) disallows recursive directory-based symlinks. Before, it could have entered infinite loop.

but Should it be possible to not destroy and exit on error in this case? like adding recursive to NORMAL_FLOW_ERRORS

In rm-modules case, the expected behavior would be to continue and process all but the problematic entry.

[paulmillr]

perhaps. pull request for the change would be reviewed