[dmd-internals] [D-Programming-Language/dmd] f20f6b: fix makefile to allow relative HOST_DMD

[GitHub via dmd-internals]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/dmd
  Commit: f20f6b8a5d420aa74238b9a3af9beac146055ae1
      https://github.com/D-Programming-Language/dmd/commit/f20f6b8a5d420aa74238b9a3af9beac146055ae1
  Author: Martin Nowak <code at dawg.eu>
  Date:   2015-08-22 (Sat, 22 Aug 2015)

  Changed paths:
    M src/posix.mak

  Log Message:
  -----------
  fix makefile to allow relative HOST_DMD

- must not list the host D compiler as dependency
  it can't be build anyhow and relying on the timestamps
  of the compilers to rebuild targets is erratic at best

- also use HOST_DMD instead of HOST_DC
  DMD should be used to refer to dmd/gdmd/ldmd2
  DC should be used to refer to dmd/gdc/ldc2


  Commit: 49dd6197389e45d3e78cdeba0628d1254b8a7343
      https://github.com/D-Programming-Language/dmd/commit/49dd6197389e45d3e78cdeba0628d1254b8a7343
  Author: Martin Nowak <code at dawg.eu>
  Date:   2015-08-22 (Sat, 22 Aug 2015)

  Changed paths:
    M .travis.yml
    A travis.sh

  Log Message:
  -----------
  test ddmd with latest gdc/ldc and dmd-2.067.1 host compilers


  Commit: 38880df21aba878abb633d2a4ed4b813190d52d2
      https://github.com/D-Programming-Language/dmd/commit/38880df21aba878abb633d2a4ed4b813190d52d2
  Author: Martin Nowak <code at dawg.eu>
  Date:   2015-08-23 (Sun, 23 Aug 2015)

  Changed paths:
    M travis.sh

  Log Message:
  -----------
  use parallel builds


  Commit: c3a2881b1e68a9d432d70963283eb32e118a0732
      https://github.com/D-Programming-Language/dmd/commit/c3a2881b1e68a9d432d70963283eb32e118a0732
  Author: David Nadlinger <code at klickverbot.at>
  Date:   2015-08-23 (Sun, 23 Aug 2015)

  Changed paths:
    M .travis.yml
    M src/posix.mak
    A travis.sh

  Log Message:
  -----------
  Merge pull request #4917 from MartinNowak/ddmd_test

test ddmd with latest gdc/ldc and dmd-2.067.1 host compilers


Compare: https://github.com/D-Programming-Language/dmd/compare/854aa3450dec...c3a2881b1e68