[phobos] [D-Programming-Language/phobos] 35ea3b: explicitly pass OS, MODEL, and DMD

[GitHub via phobos]

  Branch: refs/heads/revert-3033-revert-3006-fixup2946
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: 35ea3be8b1c35439399c8899dd2114f4f3bcbb90
      https://github.com/D-Programming-Language/phobos/commit/35ea3be8b1c35439399c8899dd2114f4f3bcbb90
  Author: Martin Nowak <code at dawg.eu>
  Date:   2015-03-03 (Tue, 03 Mar 2015)

  Changed paths:
    M posix.mak

  Log Message:
  -----------
  explicitly pass OS, MODEL, and DMD