Categorize deprecated warning

Author: nobu

ext/json/ext/parser/extconf.rb

@@ -5,6 +5,7 @@
 have_func("rb_hash_new_capa", "ruby.h") # RUBY_VERSION >= 3.2
 have_func("rb_gc_mark_locations", "ruby.h") # Missing on TruffleRuby
 have_func("rb_hash_bulk_insert", "ruby.h") # Missing on TruffleRuby
+have_func("rb_category_warn", "ruby.h") # Missing on TruffleRuby
 
 append_cflags("-std=c99")