tests: Fix failures with Guile >= 3.0.5.

Maxim Cournoyerrequested to merge
apteryks/ac-d-bus:fix-tests-latest-guile into master

The test-runner object is now reset to #f when calling the 'test-end' procedure. See the commit de5d1a7f99b8e952b115237ebc29633062f99bb9 in Guile (srfi-64: Reset test-runner-current if done) which introduced this change.

  • tests/test-signature.sps (fail-count): Bind a fail-count variable before ending tests and use it when calling exit.
  • tests/test-wire.sps (fail-count): Likewise.

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