Wladimir J. van der Laan 1a51cd1ac5
Merge #17800: random: don't special case clock usage on macOS
dc9305b6162ec615ff5fb2876e4f312051b543af random: don't special case clock usage on macOS (fanquake)

Pull request description:

  `clock_gettime()`, `CLOCK_MONOTONIC` and `CLOCK_REALTIME` are all available for use on
  macOS (now that we require macOS >=10.12 and build against 10.14). Use them rather than the [deprecated](https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/KernelProgramming/Mach/Mach.html) `mach_timespec_t` time API.

  I mentioned the possibility for this change [in #17270](https://github.com/bitcoin/bitcoin/pull/17270#discussion_r346090606).

  [master](1dbf3350c683f93d7fc9b861400724f6fd2b2f1d):
  ```bash
  2019-12-23T20:49:43Z Feeding 216 bytes of dynamic environment data into RNG
  2019-12-23T20:50:43Z Feeding 216 bytes of dynamic environment data into RNG
  ```

  This PR:
  ```bash
  2019-12-23T20:32:41Z Feeding 232 bytes of dynamic environment data into RNG
  2019-12-23T20:33:42Z Feeding 232 bytes of dynamic environment data into RNG
  ```

  ~~Depends on #16392.~~ Merged.

ACKs for top commit:
  laanwj:
    ACK dc9305b6162ec615ff5fb2876e4f312051b543af

Tree-SHA512: 18c2f336ea628f9cf7339b817381d230a18893fd9c0351bf99a39ca6f45c5b0a20af9d599d48d6c09515627d5edafa91337c17f9f790264251d2cdcb3763bbd5
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