Skip test in t/ext.t which tickles shellwords() in Text::ParseWords
below 3.23 [David Wheeler, Ken]Fixed some shell-quoting issues in do_system() on Windows [Ken,
Schwern, reported by Curtis Jewell]Fixed t/xs.t failure for missing 'const char *' typemap in 5.6
[Schwern]Added build_requires for Test::More 0.49 and Test::Harness 2.03.
Removed bundled Test::More (was not working for 5.005x anyway).
[Schwern]Minimum required perl version is now 5.6.1. [Schwern]