Hacking Session, Day 3

Stuff worked on during the hacking session on day 3:

• cal@: Review and merge pull request 1338
  ​https://github.com/macports/macports-ports/pull/1338
• cal@: Prepare a patch that allows variant names to be specified case-insensitive
  #25970
• cal@: Improve portdistcheck unit test
  [4c11f3bea113e305776751e98d5236e34175a972/macports-base], #52218
• cal@: Fix broken base regression test
  [ea77eb50b06f009629afb95321f0d5cd932c070b/macports-base]
  [0745d2d4efcbe082e13828f31c2c594c2be0a0a4/macports-base]
• g5pw@: Upgraded rust
  [a8ae6ad734645aa7082b81e34e860dd96cd7447a/macports-ports]