Merge bitcoin/bitcoin#22071: depends: latest config.guess and config.sub

7e2a989 depends: latest config.sub (2021-04-30) (fanquake)
f16d4cd depends: latest config.guess (2021-05-24) (fanquake)

Pull request description:

  This is split out of #21851. Updating these files should be mechanical, and shouldn't have to wait for that PR. Also, having support in depends for the new `arm-apple-darwin` target (added in [2593751ef276497e312d7c4ce7fd049614c7bf80](https://git.savannah.gnu.org/cgit/config.git/commit/?id=2593751ef276497e312d7c4ce7fd049614c7bf80)) is useful when debugging. i.e #22070.

  If you try and compile depends for a `arm-apple-darwin` target using master, on a x86_64 darwin machine, currently you'll get:
  ```bash
  gmake -C depends -j9 HOST=arm64-apple-darwin
  Invalid configuration `arm64-apple-darwin': machine `arm64-apple' not recognized
  shasum: hosts/.mk: No such file or directory
  <omitted>
  Makefile:111: hosts/.mk: No such file or directory
  gmake: *** No rule to make target 'hosts/.mk'.  Stop.
  ```

ACKs for top commit:
  laanwj:
    ACK 7e2a989

Tree-SHA512: 8ed99b5d486c6cbca8929a752460338b6ee17f6bf93013c76589605678853c3a01ebd631b4d3f5d6aaeb6e5c21b7bbe39afc4454d3a697fafb27678f6d2c021e

Author: fanquake