[phobos] [D-Programming-Language/phobos] cedfb8: std.getopt: Add unit test for issue 15914

[GitHub via phobos]

  Branch: refs/heads/revert-3859-getopt-checker
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: cedfb8c153b910e2d9e82112b2cbe519cd870491
      https://github.com/D-Programming-Language/phobos/commit/cedfb8c153b910e2d9e82112b2cbe519cd870491
  Author: Vladimir Panteleev <git at thecybershadow.net>
  Date:   2016-04-12 (Tue, 12 Apr 2016)

  Changed paths:
    M std/getopt.d

  Log Message:
  -----------
  std.getopt: Add unit test for issue 15914