[PATCH] gnu: Add ruby-nokogiri

[Pjotr Prins]

Sorry, the second mail got sent off too early.

Patch for the Ruby-nokogiri gem, an infamous hard to install piece of
software. Not so hard to add to GNU Guix, though I had to run 'rake
gem' 2x to create the gem (the first time it merely installs the build
directory). The tests are skipped because they currently expect the
gem to be already installed (not only built!).

I documented the process of making the patch here:

  https://github.com/pjotrp/guix-notes/blob/master/RUBYGEMS-Nokogiri.org

David Thompson gave me advice on how to introduce the new 'gem-flags'
key. Though the blame is mine if I got it wrong :)

It is a work in progress - I'll send a sanity patch upstream for
Nokogiri and get testing working. But I thought I'd share this with
you first for comments. Inclusion can be useful to others as the
package does work. It is a critical package for many Ruby gems.

Pj.

0001-gnu-Add-ruby-nokogiri.patch
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