Add const to get_*_advances API
Ouch!
diff --git a/src/hb-ot-font.cc b/src/hb-ot-font.cc
index 5820839..686c873 100644
--- a/src/hb-ot-font.cc
+++ b/src/hb-ot-font.cc
@@ -66,7 +66,7 @@
static void
hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
unsigned count,
- hb_codepoint_t *first_glyph,
+ const hb_codepoint_t *first_glyph,
unsigned glyph_stride,
hb_position_t *first_advance,
unsigned advance_stride,
@@ -86,7 +86,7 @@
static void
hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data,
unsigned count,
- hb_codepoint_t *first_glyph,
+ const hb_codepoint_t *first_glyph,
unsigned glyph_stride,
hb_position_t *first_advance,
unsigned advance_stride,
