Make some fields more generic, so that we can access them the same way
regardless of Type 1 or CFF.
* include/freetype/internal/psaux.h (PS_Builder): Change TT_Face to FT_Face.
Remove unused fields.
* src/psaux/psft.c: Update all accesses of PS_Builder.face.
Add some asserts to guard against casting T1_Face as TT_Face.
* src/type1/t1objs.h (T1_GlyphSlot): Reorder fields to follow CFF_GlyphSlot,
so that we can pretend they are the same in the interpreter.
* src/psaux/psobjs.c: Updated with above changes.
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