Fix STD build failing for target_os = "espidf" #145746
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A regression from #142938
cc @lolbinarycat
cc @ibraheemdev
ESP-IDF (and a few other embedded Tier-3 systems) is considered
cfg(unix), but it does not have theO_NOFOLLOWflag because neither of its three supported filesystems (FATFS, LitteLF and Spiffs) has symbolic links in the first place.What this fix does is to keep the
set_permissions_nofollowmethod available and non-failing for ESP-IDF, but it behaves as if noO_NONFOLLOWwas set. This should be fine as there is nothing to follow in the first place, as there are no symbolic links there.EDIT: Also added the same fix for Horizon, as requested by @Meziu.