hurd: Avoid file_check_access () RPC for access (F_OK)

hurd: Avoid file_check_access () RPC for access (F_OK)

A common use case of access () / faccessat () is checking for file
existence, not any specific access permissions.  In that case, we can
avoid doing the file_check_access () RPC; whether the given path had
been successfully resolved to a file is all we need to know to answer.

This is prompted by GLib switching to use faccessat (F_OK) to implement
g_file_query_exists () for local files.
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4272

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-ID: <20240919101439.179663-1-bugaevc@gmail.com>