[DRE-maint] Bug#693252: provide a gemspec for json_pure also

[Praveen A]

package: ruby-json
version: 1.7.3-2

I was trying to package json_pure
(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=657881) and learned
that json itself provides the pure implementation now. It would be
good if ruby-json can provide a gemspec for json_pure as well.

Thanks
Praveen
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