Log Message:
p5-GD: update to 2.67.

2.67    * fix thread-safety for GD::Simple %COLORS (#26 melak)
        * fix arc start-angle docs, RT #123277 Andrew G Gray
        * improve setBrush docs, RT #123194 Andrew G Gray
        * improve StringFT docs, RT #123193
        * replace MacOSX by darwin, and not by Mac OS X/macOS as suggested
          in PR #24
        * add GD::Image->_file method as suggested in RT #60488 by Kevin Ryde,
          also the helper GD::supportsFileType