tool_dirhie: Allow directory traversal during creation

- When creating a directory hierarchy do not error when mkdir fails due
  to error EACCESS (13) "access denied".

Some file systems allow for directory traversal; in this case that it
should be possible to create child directories when permission to the
parent directory is restricted.

This is a regression caused by me in f16bed0 (precedes curl-7_61_1).
Basically I had assumed that if a directory already existed it would
fail only with error EEXIST, and not error EACCES. The latter may
happen if the directory exists but has certain restricted permissions.

Reported-by: mbeifuss@users.noreply.github.com

Fixes https://github.com/curl/curl/issues/4796
Closes https://github.com/curl/curl/pull/4797

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