Merge #628: Fix ability to compile tests without -DVERIFY.

dcf3920 Fix ability to compile tests without -DVERIFY. (Gregory Maxwell)

Pull request description:

  Broken by 3f3964e4.

  It's important that the tests are also run without -DVERIFY due to
   the possibility that side-effects of a VERIFY_CHECK fix a bug that
   would otherwise be detected.

  Use of the verify_check macro in tests isn't sufficient.

ACKs for commit dcf392:

Tree-SHA512: ff7ca0e89e33f845656a4d7d18c0195d1378b020d67f89e900b18cf3d702aa81dd91ffd05a98953a481b83e4247eaf0c484bea12eab020efb3c966a456e8129f

diff --cc src/tests.c
Simple merge