Update Android port

* src/sfnt.c (sfnt_table_names): Add fvar, gvar, cvar.
(sfnt_read_maxp_table): Call xmalloc, not malloc.
(sfnt_read_simple_glyph): Avoid use-after-free if simple is
invalid.
(sfnt_fill_span): Fix max coverage.
(sfnt_normalize_vector): Fail if magnitude is zero.
(sfnt_measure_distance): Fix opcode order.
(sfnt_dot_fix_14): Fix implementation.
(struct sfnt_variation_axis, struct sfnt_instance)
(struct sfnt_fvar_table, struct sfnt_gvar_table)
(sfnt_read_fvar_table, sfnt_read_gvar_table, struct sfnt_blend)
(sfnt_init_blend, sfnt_free_blend, sfnt_normalize_blend)
(struct sfnt_tuple_header, struct sfnt_gvar_glyph_header)
(sfnt_read_packed_points, sfnt_read_packed_deltas)
(sfnt_compute_tuple_scale, sfnt_infer_deltas_1, sfnt_infer_deltas)
(sfnt_vary_glyph): Add WIP variation glyph implementation.
* src/sfnt.h (enum sfnt_table, struct sfnt_simple_glyph):
Likewise.

src/sfnt.h

@@ -53,6 +53,9 @@ enum sfnt_table
     SFNT_TABLE_CVT ,
     SFNT_TABLE_FPGM,
     SFNT_TABLE_PREP,
+    SFNT_TABLE_FVAR,
+    SFNT_TABLE_GVAR,
+    SFNT_TABLE_CVAR,
   };
 
 #define SFNT_ENDOF(type, field, type1)			\
@@ -61,7 +64,14 @@ enum sfnt_table
 /* Each of these structures must be aligned so that no compiler will
    ever generate padding bytes on platforms where the alignment
    requirements for uint32_t and uint16_t are no larger than 4 and 2
-   bytes respectively.  */
+   bytes respectively.
+
+   Pointer types are assumed to impose an alignmnent requirement no
+   less than that of uint32_t.
+
+   If a table has more than one kind of variable-length subtable array
+   at the end, make sure to pad subsequent subtables
+   appropriately.  */
 
 struct sfnt_offset_subtable
 {
@@ -568,25 +578,25 @@ struct sfnt_simple_glyph
   size_t number_of_points;
 
   /* Array containing the last points of each contour.  */
-  uint16_t *end_pts_of_contours;
+  uint16_t *restrict end_pts_of_contours;
 
   /* Total number of bytes needed for instructions.  */
   uint16_t instruction_length;
 
   /* Instruction data.  */
-  uint8_t *instructions;
+  uint8_t *restrict instructions;
 
   /* Array of flags.  */
-  uint8_t *flags;
+  uint8_t *restrict flags;
 
   /* Array of X coordinates.  */
-  int16_t *x_coordinates;
+  int16_t *restrict x_coordinates;
 
   /* Array of Y coordinates.  */
-  int16_t *y_coordinates;
+  int16_t *restrict y_coordinates;
 
   /* Pointer to the end of that array.  */
-  int16_t *y_coordinates_end;
+  int16_t *restrict y_coordinates_end;
 };
 
 struct sfnt_compound_glyph_component