`File.OpenFlags` is missing a `no_follow` field

[squeek502]

Dir.OpenDirOptions has a no_follow field:

zig/lib/std/fs/Dir.zig

Lines 1336 to 1337 in f36ac22

	/// `true` means it won't dereference the symlinks.
	no_follow: bool = false,

The same field should be present in File.OpenFlags

Depends on #16606 being resolved to allow implementing no_follow for Dir.access on Linux. #16738 is also potentially relevant.

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EDIT: It may actually be impossible to implement this for all supported platforms, MacOS/Darwin doesn't seem to support getting a file descriptor of a symlink itself (no O_PATH flag for the open syscall).

[squeek502]

Closing this for now until #18335 is figured out. Might re-open in the future.