Revert "brutally hack test/Makefile so it can find crypt/*.o"

This reverts commit b181eb2529b1dd92f5e43f988efa1f761386623d.
Override dh_auto_test, as 'make test' seems broken at the moment.
dhcpcd5 (6.4.7) UNRELEASED; urgency=medium
Merge branch 'ppa-base' into series/trusty

* ppa-base:
  dhcpcd5 (6.4.7) UNRELEASED; urgency=medium
  Override dh_auto_test, as 'make test' seems broken at the moment.
  Revert "brutally hack test/Makefile so it can find crypt/*.o"
dhcpcd5 (6.4.7~14.04~ppa2) trusty; urgency=medium