pangocairo-render: Make a local const

Avoiding this warning:

../pango/pangocairo-render.c:506:19: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
  for (row = 0, p = name; row < rows; row++)
                  ^ ~~~~

1 files changed, 1 insertions, 1 deletions

diff --git a/pango/pangocairo-render.c b/pango/pangocairo-render.c
index e268ebd5..614a3a44 100644
--- a/pango/pangocairo-render.c
+++ b/pango/pangocairo-render.c
@@ -374,7 +374,7 @@ _pango_cairo_renderer_draw_unknown_glyph (PangoCairoRenderer *crenderer,
   PangoCairoFontHexBoxInfo *hbi;
   gunichar ch;
   gboolean invalid_input;
-  char *p;
+  const char *p;
   const char *name;
 
   cairo_save (crenderer->cr);