tests incorrectly skipped on windows.

[coke]

This is in several test files:

plan skip_all => 'src/parrot_config.o does not exist' unless -e catfile(qw/src parrot_config.o/);

You can't rely on the object file having the extension ".o" on all platforms (and we already properly detect this during the build)

[bubaflub]

I think this patch should work, but I don't have a windows machine to test it on.

[bubaflub]

patch for windows

[bubaflub]

fix another file

[bubaflub]

Patches have been applied in 22b8e86.