Cleaning up stale dependencies

[Jeremy Lavergne]

> Perhaps you have +python27 set in your variants.conf? (I don't.) If you do, then the behavior you see is expected.

Good call: my earlier thought was unwarranted as the code for setting default_variant is in place.

> if {![variant_isset python26] && ![variant_isset python27]} {
>     default_variants +python27
> }

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