RFE: make patches_base and patches_ignore independent

[yac]

I don't even know how this emergent pattern came into existence, but patches_ignore requires patches_base.

With the power of feature tests, make sure they are independent as they should be.

[yazug]

This is an artifact of warning given if patches_ignore is used and no patches_base is present... Some of the regex for placing new magic comments tied relied on patches_base being present