Log Message:
Update p5-JSON-XS from version 2.280 to version 2.290 (upstream
version 2.29).

Pkgsrc changes:
- Canonical MASTER_SITES

Upstream changes:
2.29  Wed Mar 17 02:39:12 CET 2010
	- fix a memory leak when callbacks set using filter_json_object
          or filter_json_single_key_object were called (great testcase
          by Eric Wilhelm).