• RT 94209 document that the thread safety issue will not change and
  communicate alternative.
  
• RT 85878 be more generous with error check regex given we could be
  dealing with a pre-1.25 Carp.
  
• GH #33 Be more precise in documentation example for make_path
  error checking.
  
• GH #34 Skip Windows 2000 and earlier unit tests (test change).
  
• GH #36 Do not hardcode ENOENT (test change).