[dmd-internals] [D-Programming-Language/dmd] 6e2372: Merge pull request #4703 from WalterBright/rmMSDOS

[GitHub via dmd-internals]

  Branch: refs/heads/dmd-1.x
  Home:   https://github.com/D-Programming-Language/dmd
  Commit: 6e23728700f6c7d90d5c231108b1a45067f006b3
      https://github.com/D-Programming-Language/dmd/commit/6e23728700f6c7d90d5c231108b1a45067f006b3
  Author: Daniel Murphy <yebblies at gmail.com>
  Date:   2015-05-31 (Sun, 31 May 2015)

  Changed paths:
    M src/backend/cdef.h
    M src/backend/os.c

  Log Message:
  -----------
  Merge pull request #4703 from WalterBright/rmMSDOS

Remove DOS386, DOS16RM