Orphaned rubygem-json_pure

[Vít Ondruch]

Hello,

I have removed dependencies on rubygem-json_pure from rubygem-morph-cli 
and rubygem-multi_json, therefore nothing else depended on 
rubygem-json_pure. There is no real need for rubzgem-json_pure in 
Fedora, since jruby is long gone and ruby can use the binary 
rubygem-json, which is more performant, therefore I orphaned 
rubygem-json_pure.

Vít