Update Android port

Update Android port

* src/sfnt.c (struct sfnt_build_glyph_outline_context)
(sfnt_build_glyph_outline, sfnt_fill_span): Improve glyph
appearance by rounding coordinate values.

(struct sfnt_interpreter): New fields `twilight_original_x',
`twilight_original_y'.
(sfnt_make_interpreter): Set new fields.
(DELTAP1, DELTAP2, DELTAP3, SVTCAy, SPVTL, SFVTL, MD): Implement
instructions.
(sfnt_save_projection_vector): New argument `dual_only'.  All
callers changed.
(sfnt_address_zp2, sfnt_address_zp1, sfnt_address_zp0): Obtain
original positions in the twilight zone as well.
(sfnt_check_zp1, sfnt_interpret_fliprgoff, sfnt_interpret_fliprgon)
(sfnt_interpret_flippt, sfnt_interpret_scfs, sfnt_interpret_miap)
(sfnt_interpret_alignrp, sfnt_line_to_vector, P)
(sfnt_interpret_msirp, sfnt_interpret_ip, sfnt_interpret_call)
(load_point, sfnt_interpret_iup_1, sfnt_interpret_iup)
(sfnt_interpret_run, struct sfnt_scaled_outline)
(struct sfnt_instructed_outline, sfnt_decompose_instructed_outline)
(sfnt_build_instructed_outline, sfnt_compute_phantom_points)
(sfnt_interpret_simple_glyph, all_tests, sfnt_setup_debugger)
(sfnt_name_instruction, sfnt_draw_debugger, sfnt_run_hook)
(sfnt_verbose, main): Make glyph instructing work.

* src/sfnt.h (SFNT_POLY_ROUND): New enumerator.