[dmd-internals] [D-Programming-Language/dmd] a29ab2: fix recursive Travis-CI build

[GitHub via dmd-internals]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/dmd
  Commit: a29ab22d3fd07d58f3be6de561397bd390a2e188
      https://github.com/D-Programming-Language/dmd/commit/a29ab22d3fd07d58f3be6de561397bd390a2e188
  Author: Martin Nowak <code at dawg.eu>
  Date:   2015-09-06 (Sun, 06 Sep 2015)

  Changed paths:
    M src/posix.mak

  Log Message:
  -----------
  fix recursive Travis-CI build

- `which ./host-dmd` in the CI environment returns `host-dmd` instead
  of an absolute path and therefor fails to build


  Commit: 9bc340ecacce38e907aceff83cd1ee68f4ca9189
      https://github.com/D-Programming-Language/dmd/commit/9bc340ecacce38e907aceff83cd1ee68f4ca9189
  Author: Hara Kenji <k.hara.pg+dev at gmail.com>
  Date:   2015-09-06 (Sun, 06 Sep 2015)

  Changed paths:
    M src/posix.mak

  Log Message:
  -----------
  Merge pull request #5041 from MartinNowak/fixTravisCI

fix recursive Travis-CI build


Compare: https://github.com/D-Programming-Language/dmd/compare/2c618366437a...9bc340ecacce