pkgsrc changes:
  - Updating package of p5 module JSON and subclasses from 2.14 to 2.15
  - Setting LICENSE to ${PERL5_LICENSE} accroding to META.yaml

Upstream changes:
2.15  Tue Jun  2 16:36:42 2009
[JSON]
- made compatible with JSON::XS 2.24
- corrected copyrights in some modules.
[JSON::PP]
- modified incr_parse, pointed by Martin J. Evans (rt#46439)
- deleted a meaningless code

(sno)