freetype: support compiling with stage2 (-fno-stage1)

freetype/src/harfbuzz/buffer.zig

@@ -333,7 +333,7 @@ pub const Buffer = struct {
 
     pub fn getGlyphPositions(self: Buffer) ?[]Position {
         return if (hb_buffer_get_glyph_positions(self.handle, null)) |positions|
-            positions[0..self.getLength()]
+            @ptrCast([*]Position, positions)[0..self.getLength()]
         else
             null;
     }

freetype/src/harfbuzz/common.zig

@@ -13,7 +13,7 @@ pub const Direction = enum(u3) {
     }
 
     pub fn toString(self: Direction) [:0]const u8 {
-        return std.mem.span(c.hb_direction_to_string(@enumToInt(self)));
+        return std.mem.span(@ptrCast([*:0]const u8, c.hb_direction_to_string(@enumToInt(self))));
     }
 };
 
@@ -210,7 +210,7 @@ pub const Language = struct {
     }
 
     pub fn toString(self: Language) [:0]const u8 {
-        return std.mem.span(c.hb_language_to_string(self.handle));
+        return std.mem.span(@ptrCast([*:0]const u8, c.hb_language_to_string(self.handle)));
     }
 
     pub fn getDefault() Language {

freetype/src/harfbuzz/shape.zig

@@ -11,8 +11,9 @@ pub const ListShapers = struct {
 
     pub fn next(self: *ListShapers) ?[:0]const u8 {
         self.index += 1;
-        return std.mem.span(
+        return std.mem.span(@ptrCast(
+            ?[*:0]const u8,
             self.list[self.index - 1] orelse return null,
-        );
+        ));
     }
 };

freetype/src/harfbuzz/shape_plan.zig

@@ -68,7 +68,7 @@ pub const ShapePlan = struct {
     }
 
     pub fn getShaper(self: ShapePlan) [:0]const u8 {
-        return std.mem.span(c.hb_shape_plan_get_shaper(self.handle));
+        return std.mem.span(@ptrCast([*:0]const u8, c.hb_shape_plan_get_shaper(self.handle)));
     }
 };