[phobos] [D-Programming-Language/phobos] eafe4c: fix install target

[GitHub]

  Branch: refs/heads/phobos-1.x
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: eafe4c26b11f8e41c75d50b521f8c8ea0ed5db57
      https://github.com/D-Programming-Language/phobos/commit/eafe4c26b11f8e41c75d50b521f8c8ea0ed5db57
  Author: Walter Bright <walter at walterbright.com>
  Date:   2012-10-14 (Sun, 14 Oct 2012)

  Changed paths:
    M win32.mak
    M win64.mak

  Log Message:
  -----------
  fix install target