[parrot/parrot] ae20fa: [test] improve pcre.t for returned error string

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/parrot/parrot
  Commit: ae20fa2cb66293fbc506b375b1907aa61b81e503
      https://github.com/parrot/parrot/commit/ae20fa2cb66293fbc506b375b1907aa61b81e503
  Author: Ronald Schmidt <RonaldXS at software-path.com>
  Date:   2016-02-16 (Tue, 16 Feb 2016)

  Changed paths:
    M ChangeLog
    M t/library/pcre.t

  Log Message:
  -----------
  [test] improve pcre.t for returned error string

Closes GH #258