Ensure cmd.exe is used in pl2bat tests

[kenneth-olwing]

Tests done in cpan/ExtUtils-PL2Bat/t/make_executable.t are geared to work with cmd.exe; a user having something else as the COMSPEC (e.g. in my case, TCC (see jpsoft.com) may well get confusing errors. Hence, ensure that COMSPEC is set to cmd.exe.

[Leont]

Changes in cpan/ should be done upstream first. I've just released a new ExtUtils::PL2Bat to CPAN with your fix, assuming no problems show up we will update the version in core as well.

[kenneth-olwing]

Aha. Thanks for your help!

ken1