FC_FULLNAME wrong for variable-font instances

Submitted by Behdad Esfahbod

Assigned to fon..@..op.org

We don't override it. We should create fullname from family and style. It's hard to do it right with regard to different languages...

For varfonts, currently fullname gets set to the fullname of the default style. We should probably just copy family to fullname for varfonts.

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