FT_New_Face always creates a new mapping of the font file, so do the
mapping by hand and use FT_New_Memory_Face instead.

Let dwarf and msc use this new feature.
As we also add global symbol without addresses, don't take those
constant symbols into account for searches by address.

Make use of it to get rid to module_compute_num_syms.

wineps.drv: When we're using a GlyphDirectory we should clear the offsets and lengths of the loca and glyf tables in addition to changing their names.

Should fix printing on Mac based cups servers.