Pango doesn't provide find_shaper() anymore.

--- pangox-compat-0.0.2/pangox.c.orig	2012-08-28 01:19:32.000000000 +0000
+++ pangox-compat-0.0.2/pangox.c	2022-03-31 21:04:30.326349155 +0000
@@ -279,7 +279,6 @@
 
   font_class->describe = pango_x_font_describe;
   font_class->get_coverage = pango_x_font_get_coverage;
-  font_class->find_shaper = pango_x_font_find_shaper;
   font_class->get_glyph_extents = pango_x_font_get_glyph_extents;
   font_class->get_metrics = pango_x_font_get_metrics;
   font_class->get_font_map = pango_x_font_get_font_map;