[parrot/parrot] a5d4e2: replace some magic numbers with a define

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/parrot/parrot
  Commit: a5d4e230575760234cd790c825c917850d4cc488
      https://github.com/parrot/parrot/commit/a5d4e230575760234cd790c825c917850d4cc488
  Author: NotFound <julian.notfound at gmail.com>
  Date:   2012-04-29 (Sun, 29 Apr 2012)

  Changed paths:
    M src/string/api.c

  Log Message:
  -----------
  replace some magic numbers with a define