build: ruby: Rewrite build system to use gem archives.
Co-Authored-By: Pjotr Prins <pjotr.public01@thebird.nl>
* guix/build-system/ruby.scm (lower): Remove git dependency.
(rubygems-uri): New procedure.
* guix/build/ruby-build-system (gitify): Delete.
(unpack): Use 'gem unpack' utility.
(check): Add docstring.
(build): Repack modified gem.
(install): Rebuild unpacked gem and install it.
(%standard-phases): Remove gitify and build phases.
* gnu/packages/ruby.scm (ruby-hoe, ruby-rake-compiler, ruby-i18n,
ruby-rspec-support, ruby-rspec-core, ruby-diff-lcs-for-rspec,
ruby-rspec-expectations, ruby-rspec-mocks, ruby-rspec, bundler,
ruby-useragent, ruby-bacon, ruby-arel, ruby-connection-pool,
ruby-net-http-persistent, ruby-minitest, ruby-minitest-sprint,
ruby-minitest-bacon, ruby-daemons, ruby-git, ruby-slop,
ruby-multipart-post): Convert to new build system.
* doc/guix.texi (ruby-build-system): Document the gem archive requirement.
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