Norman Feske 3ac970ac1d Streamline Timestamp::INVALID values
This is a follow-up patch for issue #1784 that solves two
inconsistencies.

- The Vfs::Timestamp::INVALID matches File_system::Timestamp::INVALID
- The Noux libc plugin tests for Timestamp::INVALID instead of a
  positive value.

The patch fixes the mtime info as shown in directory listings in
Sculpt's inspect window.
2019-11-21 14:26:27 +01:00
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