[phobos] [D-Programming-Language/phobos] c0a34b: Fix spacing around equals

[GitHub via phobos]

  Branch: refs/heads/schveiguy-patch-1
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: c0a34b41f72b1b8ce7027bad474a8617a1421237
      https://github.com/D-Programming-Language/phobos/commit/c0a34b41f72b1b8ce7027bad474a8617a1421237
  Author: Steven Schveighoffer <schveiguy at yahoo.com>
  Date:   2016-03-03 (Thu, 03 Mar 2016)

  Changed paths:
    M std/experimental/allocator/package.d

  Log Message:
  -----------
  Fix spacing around equals

See https://github.com/D-Programming-Language/phobos/pull/4022#commitcomment-16474681