dc<%>: fix baseline for slow-path non-combined text drawing
dc<%>: fix baseline for slow-path non-combined text drawing

For example, fix baseline when drawing "a\u2144" with the
default fonr under Windows, where #\u2144 is subtituted from
another font.

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket